Question

USSR and USA joined allies in this year​

Answer 1

Answer:

Beginning in July of 1940, a series of negotiations took place in Washington between Under-Secretary of State Sumner Welles and Soviet Ambassador Constantine Oumansky. ... The United States entered the war as a belligerent in late 1941 and thus began coordinating directly with the Soviets, and the British, as allies.

Explanation:

Answer 2

Answer:

Beginning in July of 1940, a series of negotiations took place in Washington between Under-Secretary of State Sumner Welles and Soviet Ambassador Constantine Oumansky. ... The United States entered the war as a belligerent in late 1941 and thus began coordinating directly with the Soviets, and the British, as allies.