Who benefitted economically from slavery?

It was a both way profit, the Americans through free labor and the African leaders through selling war captives.

Explanation:

The development of the trade

Portugal and Britain were the two most 'successful' slave-trading countries accounting for about 70% of all Africans transported to the Americas. Britain was the most dominant between 1640 and 1807 when the British slave trade was abolished.

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.