In your opinion, how would this history of mistrust between the United States and the USSR affect relationship between them even during the period of alliance during WWII?

The history of mistrust between the United States and the USSR, even during their alliance in WWII, would have likely affected their relationship in several ways:

1. Communication: The mistrust could have led to guarded communication between the two nations. They might not have shared all information with each other, fearing that the other could use it against them in the future.

2. Strategy: The mistrust could have influenced their war strategies. Each country might have made plans keeping in mind that they might have to defend against the other in the future.

3. Post-war plans: The mistrust would have definitely affected their plans for the post-war world. This is evident in the way the Cold War played out, with both nations trying to limit the other's influence.

4. Cooperation: The mistrust might have limited the level of cooperation between the two nations. They were allies out of necessity, not out of choice. Once the common enemy (Nazi Germany) was defeated, the alliance quickly fell apart.

5. Perception: The history of mistrust would have affected how each nation perceived the other's actions. Even benign actions might have been seen as threatening, leading to a cycle of mistrust and suspicion.

In conclusion, the history of mistrust between the United States and the USSR would have cast a long shadow over their alliance during WWII, affecting their communication, strategies, post-war plans, cooperation, and perceptions of each other.