Explain why America stopped the Policy of Isolationism in 1941?

Because Japan Bombed pearl harbor, thus involving america in the war

Explanation:

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in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.