Differing objectives: The Allied powers entered the war with different objectives. The United States, for example, was primarily concerned with defeating Japan and protecting its own interests in the Pacific. Britain, on the other hand, was more focused on defeating Germany and preventing the Soviet Union from gaining too much power in Europe. These differences in objectives sometimes led to conflict between the Allies.
Competition for resources: The Allied powers were competing for the same resources, such as oil, food, and raw materials. This competition sometimes led to conflict between the Allies. For example, the United States and Britain quarreled over access to oil in the Middle East.
Political differences: The Allied powers had different political systems. The United States was a capitalist democracy, while the Soviet Union was a communist dictatorship. Britain was a parliamentary democracy, but it maintained close ties to the British Empire. These political differences sometimes led to conflict between the Allies. For example, the United States and the Soviet Union quarreled over the future of Eastern Europe.
Cultural differences: The Allied powers had different cultures. The United States was a melting pot of many different cultures, while the Soviet Union was a relatively homogeneous society. Britain was a traditional society with a strong sense of national identity. These cultural differences sometimes led to misunderstandings and conflict between the Allies. For example, the Americans found the Soviet Union's strict censorship and control of the media to be oppressive.
Despite these tensions, the Allied powers were able to work together to defeat their common enemy. However, the tensions that developed during the war would continue to simmer after the war and would occasionally erupt into conflict.