Answer:
The European countries were on a race to see who could out power the other. In order to achieve more power the European Nations decided to colonize other lands. Taking their resources to better their military and everyday life. This included food, new clothes, and new technological advancements.
Explanation:
Because door of world is open for all..
and so U.S entered WW1
America mainly stayed neutral during WWII. When Japanese forces bombed Pearl Harbor, Roosevelt felt it appropriate to declare war on Japan, thus entering the war.
The answer is A.
