Final answer:
The US role changed after WWII with increased global influence and rivalry with the Soviet Union.
Step-by-step explanation:
After World War II, the role of the United States underwent significant changes. Rather than allying closely with the Soviet Union, the US and the Soviet Union became rivals in what was known as the Cold War. The US emerged as a global superpower and increased its influence in the world, both politically and economically. Through measures like the Marshall Plan and establishment of military alliances such as NATO, the US sought to shape the post-war world order and prevent the spread of communism.
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