Why did the allies distrust each other?

The Allies during World War II, comprising mainly the United States, the Soviet Union, and the United Kingdom, harbored mutual distrust due to differing ideologies, geopolitical interests, and historical rivalries. The U.S. and the U.K. were capitalist democracies, while the Soviet Union was a communist state, leading to conflicting visions for post-war Europe. Additionally, past grievances and suspicions, especially concerning the Soviet Union's expansionist tendencies, heightened tensions among the Allies. This distrust persisted even as they collaborated against a common enemy, influencing post-war relations and the onset of the Cold War.