The three major migration of
African-Americans during the current distribution in the US are the following:
1.
Forced relocation from
Africa slavery
2.
Great Migrations from the
south to the north before and after WW I and WW II to slog in the factories
3.
<span>Development of the ghettos
to neighbouring areas during the 1950s and 1960s.</span>
Slave owners turned to cotton production as a way to prosper due to its high demand and so did the demand on slavery.
I believe it's D. They spread industrial technologies and products across wide areas.
This answer would be 3: breads