Why did southern planters begin to use enslaved africans to work in the fields

In italy, the distance between milan in the north and palermo,sicily, in the south is about 550 miles. in the united states, the distance betweenboston, massachusetts, and savannah, georgia, is about 900 miles. do you think the american revolutionaries of 1776 in the 13 colonies faced some of the same challenges as the patriots who struggled for italian unity in the 1860s?  

What do u think caused the size of the roman empire to change

Who was the 2nd president of the united states?