Which of the following was a reason the us adopted a policy of isolationism before world war 2?

The main policy of the United States to go into isolationism just before World War II was to avoid any alliance formation with any other nations of the world.

Explanation:

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its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.