During The African American population of cities in the northern states
the
A. increased; Great Migration
B. decreased; American Revolution
c. decreased; Great Migration
D. increased; American Revolution

A. increased; Great Migration

Explanation:

When the migration began, 90 percent of all African-Americans were living in the South. By the time it was over, in the 1970s, 47 percent of all African-Americans were living in the North and West. A rural people had become urban, and a Southern people had spread themselves all over the nation.