It was General Dwight Eisenhower who served as Supreme Commander of the Allied Forces for D-Day, and indeed in the months leading up to D Day as well. He would later become president.
Do you mean "how did the roman empire fall?" because the answer for that is because since the roman empire became too big so they divided it for better control which ended up in invasions
15. B
16. D
17. F
18. E
19. A
20. C
One of the reasons why the United States looked to the Pacific for new markets is because labor and production costs were far cheaper there than they were domestically--meaning products could be produced and shipped for less.
African Americans and abolitionists rejoiced, but loyal slave states continued to have slaves.
