Which country was the last to join the Allied Powers?

Great Britain

France

United States

China

It was the "United States" that was last to join the Allied Powers, since the United States wanted to remain neutral in the war until the Japanese bombed Pearl Harbor.

Answer;

United states;

Explanation;

During the second world war; the chief allied powers were the Great Britain, France, the Soviet Union, the United states, and China.

The soviet Union join the Allied powers in June 1941, while the United states joined in December 8, 1941, making it the last to join the allied powers.

The allied powers fought the Central powers or the Axis powers in World War II.