O<span>verpopulation, growing cities, damming of rivers, and the need for more irrigation.</span>
The answer is unsure to me because i don't see the examples above, but I'd go with d.
I think the correct answer is C
B. is the answer you will want to put. While they did let African Americans fight in the war in a special unit, they would not allow that unit to be led by an African American. It was headed by a white man named Robert Gould Shaw.