Answer:
Disease and starvation
Explanation:
Most contemporary historians estimate that between 9.4 and 12 million Africans arrived in the New World. Disease and starvation due to the length of the passage were the main contributors to the death toll with amoebic dysentery and scurvy causing the majority of deaths.
<span>The share of people in the labor force involved in agricultural work has not only declined, it has declined dramatically over the last century. Although agricultural employment had already been in gradual decline from its peak, the widespread introduction of the mechanized tractor and combine in the 1920s caused a sharp decline which has continued, though at a slower pace, to this day. Currently about 2% of the workforce is engaged in agricultural production, down from 50% a century and a half ago.</span>
radiation I believe that is it
The colonization period in Haiti was difficult, one of the hardest ones in all the Americas, the slavery was cataloged as the cruelest ever known, and the general live conditions for middle and lower classes were not good at all.
At the bottom of the social pyramid were the slaves, however the french soldiers had really hard duties on those times, they can be cataloged like <em>¨White slaves¨</em>, obviously they haven´t to perform the slave´s work, however duties turning around the slavery, extended shifts and dreadful life conditions made their work a difficult one.
So Haitian Slaves and French soldiers were technically in a similar spot, however, the slaves had survival and another kind of advantages over the French soldiers, a key point was the resistance or partial immunity to different diseases, unfortunately, that wasn´t the French´s case.
Yellow fever was a major issue to the French forces in Haiti, debilitated the army, and was one of the key points of the posterior events (the slavery and Haiti revolutions).
So definitely the two kinds of newcomers to Haiti, haven´t the same fate, the majority of slaves adapted quickly to new territory. the opposite happened to the French soldiers.