What role did the united states play in world war two and what were the results of world war two on the usa

The United States role and aftermath of World war two are discussed below.

Explanation:

The United States played a very crucial role in World war II However, the United States joined world war two very late but it played a significant role.Allied forces was led by the United States and the United Kingdom they battled against Axis powers for the Control over Europe and North Africa.After the end of the World war two at home in America, people started losing jobs because the need for war supplies reduced.

The answer is crop yield.