The Neutrality Acts in general, which were passed in the 1930s, were passed as Europe was once again moving towards armed conflict. The US was a very isolationist country after World War I and wanted to make it clear to the world that they would not intervene.
No they can not because they need to interfere with other nations to keep their influence and sometimes power
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The first gold is found by James W. Marshall in California gold rush on january 24th, 1848
