Well in the great depression millions of Americans lost their jobs so they had no money for food or their home, and if they got hurt they couldn't afford to go to the hospital. The united states would not get out of the depression until 1941 when japan bombed pearl harbor and get the united states into world war 2
The major Atlantic slave trading nations, ordered by trade volume, were: the Portuguese<span>, the </span>British<span>, the </span>French<span>, the </span>Spanish<span>, and the </span>Dutch Empire. Several had established outposts on the African coast where they purchased slaves from local African leaders.[5]These slaves were managed by a factor who was established on or near the coast to expedite the shipping of slaves to the New World. Slaves were kept in a factory while awaiting shipment. Current estimates are that about 12 million Africans were shipped across the Atlantic,[6]<span> although the number purchased by the traders is considerably higher, as the passage had a high death rate.</span>[7][8]<span> Near the beginning of the nineteenth century, various governments acted to ban the trade, although illegal smuggling still occurred. In the early twenty-first century, several governments issued apologies for the transatlantic slave trade.</span>
I think it's because slavery costs less...just a guess.
This had brought the United States into the War. If not for the Americans many events like D-Day or the Atom bombs strike would not have happened. Ultimately this would but Britan in Ruins and leave Russia as the only support to destroy the germans. From their, Japan could attack Russia forcing it to surrender. Leaving the Axis in a worldwide victory