Why did the United States abandon its policy of isolationism after World War II ?

The 20th Century: The End of US Isolationism. Against the recommendation of President Woodrow Wilson, the U.S. Senate rejected the war-ending Treaty of Versailles, because it would have required the U.S. to join the League of Nations.

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monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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