What was the United States hoping to avoid with its policy of isolationism?

They were hoping to avoid being drawn into other wars that were not related to territorial self-defense.

Explanation:

When you think of isolation, what usually comes to mind, is shutting yourself out or someone shutting others out. The isolationism policy was in place to "shut out" other country's from dragging them into wars.

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an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.