Why were African Americans particularly harmed when the stock market crashed?.

The stock market crash of 1929 was not the sole cause of the Great Depression, but it did act to accelerate the global economic collapse of which it was also a symptom. By 1933, nearly half of America's banks had failed, and unemployment was approaching 15 million people, or 30 percent of the workforce.

these civilizations were located around fertile rivers, where they could produce an abundance of crops

(b) britain had a much larger navy than the u.s.

(d) the u.s. had a small army compared to britain.