求翻译：首先，从政治层面上考虑，美国历来的孤立主义思想占据了上峰，美国国内的经济危机和人民的反战导致战争初期保持中立。是什么意思？

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First, considered from the political stratification plane that, the American always isolated principle thought occupied the one's superior official, the American domestic economic crisis and the people anti-war causes the initial stages of war maintain neutrality.

First, consider from the political aspect, United States traditionally isolationist inhabits apt, United States economic crisis in the country and the people of the war led to the beginning of the war to remain neutral.

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