What led to disagreement between the US and the USSR during world war 2?

Disagreements between the US and the USSR during World War II primarily stemmed from ideological differences and conflicting post-war visions. The US favored democratic governance and capitalism, while the USSR promoted communism and a state-controlled economy. Tensions also arose over the timing and nature of military operations, particularly the delay in opening a second front in Europe, which the Soviets felt was necessary to relieve pressure on their forces. These underlying issues set the stage for the Cold War tensions that followed the war.