美国二战之初为何中立?

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第二次世界大战初期,纳粹德国的军队灭法国、困英伦,剑指苏伊士运河,兵临奠斯科城下,肆虐欧洲。而大西洋彼岸的美国却一直严守“中立”,隔岸观火,无论欧洲人怎样劝说就是不肯参战。直到1941年3月才犹犹豫豫地出台“租借法案”,同意在物资、军火上大力帮助欧洲,但仍旧不愿意参战。
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