All are true of African American troops in the Civil War except they were not in the military until the Emancipation Proclamation
was issued
only a few served in the military
most were assigned very menial tasks
those captured by Confederates were treated harshly

only a few served in the military.

Explanation:

I wouldn't say 179,000 men are a few people.

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.

the answer is