How did the United States influence the European theater of World War II?

Even when the outcome of the war became evident, the US wanted to secure areas of influence in post-WW2 Europe and not to allow all the Europe to fall under Soviet influence. So they had to make the ground landing in Europe in the end of the war so to capture as large territory as possible before the Soviet arrival. The Soviets did not object to that because they had suffered very heavy casualties, and wanted any help that was possible, even at expense of post-WW2 influence.

Explanation:

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the roman empire began to fall