Describe how the ethnic distribution of African Americans in Detroit happened.

From 1910 to 1930, the Black population of Detroit increased from under 6,000 to over 120,000, as the city developed as the fourth largest in the country. By 1920, of Michigan's Black residents, 87% were born outside of the state, and most of those came from the South.

Explanation:

c) troops march forward in close formation against newer, more accurate weapons

number 4. should be the correct answer