Effect of Slave Trade on Familial Relationshipsin Ghana
Editor's note: This column first appeared every bit a chapter in the Vox eBook, The Long Economic and Political Shadow of History, Book two, available to download here.
Betwixt 1400 and 1900, the African continent experienced four sizeable slave trades. The largest and all-time-known was the trans-Atlantic slave merchandise where, outset in the 15th century, slaves were shipped from West Africa, West Fundamental Africa, and Eastern Africa to the European colonies in the New World. The three other slave trades – the trans-Saharan, Red Sea, and Indian Ocean slave trades – were smaller in scale and predated the trans-Atlantic slave trade. During the trans-Saharan slave merchandise, slaves were taken from south of the Saharan desert and shipped to Northern Africa. In the Red Bounding main slave trade, slaves were taken from inland of the Ruby-red Body of water and shipped to the Middle Due east and India. In the Indian Body of water slave trade, slaves were taken from Eastern Africa and shipped either to the Eye East, India, or the plantation islands in the Indian Ocean. In full, close to 20 million slaves were taken from the continent (Nunn 2008). According to the best estimates, by 1800 Africa'due south population was one-half of what it would take been, had the slave trades not occurred (Manning 1990).
Slaves were captured through kidnappings, raids, and warfare. A summary of the method of enslavement among a sample of 144 former slaves is provided in Table 1. Historical accounts propose that the pervasive insecurity, violence and warfare had detrimental impacts on the institutional, social, and economical development of societies. At that place are numerous examples of the slave trades causing the deterioration of domestic legal institutions, the weakening of states, and political and social fragmentation (e.g. Inikori 2000, 2003, Heywood 2009).
Table 1. The methods of enslavement of Koelle'due south Informants
Notes: The data are from Sigismund Koelle's Linguistic Inventory. The sample consists of 144 informants, interviewed by Koelle, for which their ways of enslavement is known.
The most illustrative example of this is the experience of the Kongo Kingdom, which was contacted in 1493 by Diogo Cao. Initially, a various array of products was traded betwixt the Kongo Kingdom and the Portuguese, including copper, textiles, ivory, and slaves. At first, the but slaves to exist traded were prisoners of war and criminals. However, the Portuguese demand for slaves, the pervasiveness of slave traders and merchants, and competition for the throne within the Kingdom all resulted in a dramatic and uncontrollable increase in slave capture and raiding throughout the Kingdom. By 1514, Rex Afonso (the Kongo Male monarch) had already written to the King of Portugal, complaining that the Portuguese merchants were colluding with noblemen to illegally enslave Kongolese citizens. In 1526, in an try to end the merchandise, King Afonso requested the removal of all Portuguese merchants. In the stop, his efforts were unsuccessful. Big scale slave-raiding continued unchecked into the 16th century, when information technology culminated in the Jaga invasion of 1568-1570. Big-scale civil war ensued from 1665-1709, resulting in the collapse of the once-powerful Kingdom (Heywood 2009).
An empirical literature has emerged that aims to supplement these historical accounts with quantitative estimates of the long-run touch of Africa's slave trades. The first paper that attempted to provide such estimates was Nunn (2008). In the written report, I undertook an empirical examination, with the following logic. If the slave trades are partly responsible for Africa'southward current underdevelopment, then, looking beyond different parts of Africa, 1 should discover that the areas that are the poorest today should as well be the areas from which the largest number of slaves were taken in the by.
To undertake this study, I had to first construct estimates of the number of slaves taken from each land in Africa during the slave trades (i.e. between 1400 and 1900).
These estimates were constructed by combining information on the number of slaves shipped from each African port or region with data from historical documents that reported the ethnicity of over 106,000 slaves taken from Africa. Effigy i provides an image showing a typical page from these historical documents. The documents shown are slave manumission records from Zanzibar. Each row reports information for one slave, including his/her proper name, ethnicity, age, and and so on.
Subsequently constructing the estimates and connecting these with measures of modernistic twenty-four hours economical evolution, I plant that, indeed, the countries from which the near slaves had been taken (taking into business relationship differences in country size) were today the poorest in Africa. This tin can be seen in Figure 2, which is taken from Nunn (2008). Information technology shows the relationship betwixt the number of slaves taken between 1400 and 1900 and average real per capita GDP measured in 2000. Every bit the effigy clearly shows, the human relationship is extremely strong. Furthermore, the human relationship remains robust when many other cardinal determinants of economic evolution are taken into account.
Figure 1 Excerpt from document taken from Zanzibar archives
Figure ii The relationship between slave exports (normalised past a country's country expanse) and existent per capita Gross domestic product in 2000. Both variables are measured on a log calibration
An culling estimation of the human relationship shown in Figure two is that the parts of Africa from which the largest number of slaves were taken were initially the nigh underdeveloped. Today, considering those characteristics persist, these parts of Africa continue to exist underdeveloped and poor.
I also tested this alternative hypothesis by checking whether it was, in fact, the initially to the lowest degree developed parts of Africa that engaged well-nigh heavily in the slave trades. I detect that the data suggest that, if anything, information technology was the parts of Africa that were initially the most adult, not least developed, that supplied the largest number of slaves. In the analysis, I also used a statistical technique chosen instrumental variables estimation to place the causal effect of the slave trade on economical development. The findings from the instrumental variables estimates suggested that increased extraction during the slave trades did, indeed, cause worse economic functioning. Overall, the determination from the analyses is that the relationship shown in Effigy 2 is well-nigh likely causal and non spurious.
My estimates in Nunn (2008) allowed, for the first time, the impacts the slave trades had on economic evolution to exist understood quantitatively. In particular, using the estimates, one is able to calculate how much more developed Africa would be, if the slave trades had non taken place. These calculations were undertaken in Nunn (2010). As an initial stride in the calculation, first note that the hateful level of average per capita income of the countries in Africa is $i,834 (measured in 2000). This is significantly lower than the income for the rest of the world (which is $8,809), and information technology is much lower even than the income of other developing countries (which is $four,868), where a developing country is divers as i with less than $14,000 in per capita income. Co-ordinate to the estimates from Nunn (2008), if the slave trades had not occurred, then 72% of the average income gap between Africa and the balance of the world would not exist today, and 99% of the income gap between Africa and other developing countries would non be. In other words, had the slave trades not occurred, Africa would not be the most underdeveloped region of the world and it would take a similar level of development to Latin America or Asia.
My findings in Nunn (2008) provided suggestive evidence that much of Africa'southward poor performance tin can exist explained by its history, which is characterised by over 400 years of slave raiding. Although my analysis stopped short of providing a definitive understanding of exactly how and why the slave trades were and then detrimental to economic development, information technology did provide suggestive evidence that was consistent with historical accounts of the slave trades resulting in a weakening and underdevelopment of political structures, as well as in impeding the formation of broader ethnic groups, leading to more than ethnic diversity. The study showed that the countries from which the largest numbers of slaves were taken were as well the areas that had the most underdeveloped political structures at the terminate of the 19th century, every bit well as being the countries that are the near ethnically fragmented today.
A number of studies followed on from the research in Nunn (2008), by attempting to better understand the channels through which the slave trades affect economic evolution today. Green (2013) revisited the affect of the slave trade on ethnic fractionalisation. He extended the findings in Nunn (2008) past examining the unabridged globe, and constructing estimates of the export of slaves in all countries in the earth. Using these data, he also constitute a strong relationship between slave exports and greater ethnic fractionalisation.
According to his estimates, all of the departure in ethnic fractionalisation between Africa and the rest of the world tin can be explained by its experience with the slave trades.
In a series of studies, Whatley and Gillezeau (2011) and Whatley (2014) combine slave shipping records with ethnographic data and estimate the human relationship betwixt slave shipments and institutional quality and indigenous diverseness in the locations shut to the ports of shipment. Their assay, consistent with Nunn (2008) and Greenish (2013), indicates that the slave trades did issue in greater ethnic fractionalisation. In add-on, their analysis also shows that the slave trades resulted in a deterioration of local ethnic institutions, measured in the tardily pre-colonial period.
Some other subsequent study, undertaken by Nunn and Wantchekon (2011) asks whether the slave trades resulted in a deterioration of trust. The newspaper'southward line of enquiry was motivated past two facts. The outset is that trust has been long-hypothesised to be an important foundation for economical prosperity (e.g. Algan and Cahuc 2010). The second was the fact that, during the slave trades, individuals frequently turned on 1 some other, kidnapping, tricking, and selling each other into slavery. The existing historical evidence indicates that these forms of expose were common. For example, among the sample of slaves reported in Table 1, 20% became slaves because they were tricked by a family member or friend.
In our study, Wantchekon and I extended the data structure efforts in Nunn (2008) and constructed estimates of the number of slaves taken from each ethnic group in Africa (rather than land). The ethnicity level estimates are displayed visually in Effigy 3. The analysis combined the ethnicity-level slave export estimates with fine-grained household survey data, which reports individuals' trust of those around them, whether neighbours, relatives, local governments, co-ethnics, or those from other ethnicities. The study documented a potent negative relationship betwixt the intensity of the slave trade amongst ane'south ethnic ancestors and an individual'southward trust in others today.
The study then attempted to distinguish betwixt the two about likely channels through which the slave trades could have adversely affected trust. One is that the slave trades fabricated individuals and their descendants inherently less trusting. That is, information technology created a civilisation of distrust. In the insecure environment of the slave trade, where it was common to experience the betrayal of others, fifty-fifty friends and family, greater distrust may have adult, which could persist over generations even afterward the end of the slave trade.
Another possibility is that the slave trades may have resulted in a long-term deterioration of legal and political institutions, which are then less able to enforce good behaviour amongst citizens, and equally a result people trust each other less today.
The written report undertook a number of different statistical tests to identify the presence and strength of the two channels. They found that each of the tests generated the same answer: both channels are present. The slave trades negatively affected domestic institutions and governance, which results in less trust today. In addition, the slave trade also straight reduced the extent to which individuals were inherently trusting of others. Nosotros too found that, quantitatively, the second channel is twice equally large equally the first channel.
The ethnicity-level slave export estimates I constructed with Wantchekon spurred a second line of research that looked into other impacts of the slave merchandise, using the new finer-grained data. For instance, Zhang and Kibriya matched the ethnicity-level slave export data from Nunn and Wantchekon (2008) with fine-grained data on the location and intensity of conflicts within Africa from 1997-2014. They find a strong positive relationship between the intensity of the slave trades and the prevalence of ceremonious disharmonize today. Given the strong link between income and disharmonize, this probable represents an of import channel behind the reduced-form human relationship betwixt the slave trades and income documented in Nunn (2008).
A number of subsequent studies take likewise explored other cultural consequences of the slave trades. For example, research by Edlund and Ku (2011), Dalton and Leung (2014), and Bertocchi and Dimico (2015) constitute that the trans-Atlantic slave trade resulted in a long-term increment in the prevalence of polygyny (i.e. the practice of men having multiple wives). This is due to the fact that it was primarily males who were captured and shipped to the Americas, resulting in a shortage of men and skewed sexual activity ratios inside many parts of Africa. Interestingly, Dalton and Leung (2014) found that there is no testify of such an bear upon for the Indian Bounding main slave merchandise, where at that place was not a potent preference for male slaves. This has led the authors to conclude that Africa'southward history of the slave trades is the principal explanation for why today polygyny is much more than prevalent in Westward Africa than in East Africa.
Figure 3 Maps showing the number of slaves taken from each ethnic group in Africa during the trans-Atlantic and Indian Ocean slave trades
a) Indian slave exports
b) Atlantic slave exports
The written report by Bertocchi and Dimico (2015) is particularly interesting, because it takes the assay 1 pace further and shows that the greater prevalence of polygyny, which arose due to the slave trade, has led to an increment in HIV rates. They document that women who are in a polygynous relationship are more probable to have sexual partners other than their husband. This is perhaps not surprising, since in polygamous societies wealthy older men are typically the ones who have multiple wives, leaving a large number of young able-bodied men, without wives, able and willing to engage in extramarital relationships. Thus, according to the authors' findings, the trans-Atlantic slave trade is an important cistron in explaining the loftier rates of HIV in Africa today.
A study past Teso (2016) also examined the consequences of the skewed sex ratio that resulted during the trans-Atlantic slave merchandise, merely focused on the impacts on female labour strength participation. The shortage of males in the population, during the trans- Atlantic slave trade, meant that women had to undertake many of the tasks traditionally performed by men, such as those in agronomics, or in the military machine, and to accept positions of leadership and authority. The Dahomean female 'Amazon' army, shown in Figure 2, is the best-known example of this. The female regular army was established past Dahomey in the 17th century at the height of the slave merchandise, and their existence continued until the end of the 19th century. Teso's (2016) research shows that those parts of Africa that experienced the trans-Atlantic slave trade most severely accept higher rates of female labour forcefulness participation today.
Figure 4A photo of the female person army of Dahomey, who were ofttimes referred to as 'Amazons'
A number of studies have turned the line of research started in Nunn (2008) on its caput past asking, not 'What were the consequences of the slave trades?', but 'What were the causes of the slave trades?'. Fenske and Kala (2015) examined what role weather played by combining information on slave shipments with data on annual historical temperatures, measured at a v-degree grid-cell level. They plant that negative weather condition shocks (taking the form of abnormally cold years) increased the supply of slaves from the locations that experienced these shocks. They also find that locations that experienced such shocks during the acme of the slave trade tend to have lower income levels today. In a dissever study, the same authors examined how the suppression of the slave merchandise afterward 1807 affected slave shipments (Fenske and Kala 2016). Not surprisingly, the suppression led to a decline in slave exports, although this was focused in British-controlled parts of the continent. The authors also showed that the reject in slave exports occurred alongside an increase in violence and coercion within the continent. Thus, the evidence suggests that not only did the slave trade have detrimental effects, but mayhap its abolition did too.
A study by Nunn and Puga (2015) has examined the extent to which geography afflicted the capture and export of slaves during the slave trades. My co-author and I used the information from Nunn (2008) to document how uneven terrain, taking the form of cliffs, ridges, and escarpments, was used by societies to defend confronting and escape from slave raiders. The uneven terrain could exist used to help build defensive fortifications and to provide places to escape, in the face of slave raids. We prove that, equally a upshot, those places in Africa that are more than rugged were better able to escape the slave trade and, thus, are richer today.
Although research understanding the long-term impacts of Africa's slave trades is still in progress, the evidence accumulated up to this betoken suggests that this historic event played an of import part in the shaping of the continent, in terms of non only economic outcomes, simply cultural and social outcomes also. The testify suggests that it has affected a broad range of important outcomes, including economic prosperity, ethnic variety, institutional quality, the prevalence of conflict, the prevalence of HIV, trust levels, female person labour strength participation rates, and the exercise of polygyny. Thus, the slave trades announced to accept played an important role in shaping the fabric of African social club today.
References
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Bertocchi, Yard and A Dimico (2015), The Long-Term Determinants of Female person HIV Infection in Africa: The Slave Trade, Polygyny, and Sexual Behavior, IZA DP No. 9102
Dalton, J T and T C Leung (2014), "Why is Polygyny More Prevalent in Western Africa? An African Slave Trade Perspective", Economic Development and Cultural Alter, 63 599-632.
Edlund, L and H Ku (2011), The African Slave Trade and the Curious Instance of General Polygyny, MPRA Paper NO. 52735
Fenske, J and N Kala (2015), "Climate and the Slave Trade", Journal of Development Economics, 112: 19-32.
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Teso, E (2016), The Long-Term Result of Demographic Shocks on the Evolution of Gender Roles: Evidence from the Transatlantic Slave Trade, Working Newspaper, Harvard Academy.
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