Why did many African Americans migrate to the North during this era? to work on large farms
to fight for political rights
to search for war-related work
to participate in military training

to search for war-related work

Explanation:

Why did many African Americans migrate to the North during this era?

to search for war-related work

explanation:

may i ask what challenges?

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.