Richard Nixon sent soldiers into Cambodia allegedly to destroy command and support facilities of north Vietnamese troops during the Vietnam war. So public outcry against the invasion of a neutral country resulted and then congress passed the war powers act
The Cruscades. Without them, we wouldn't have slaughter of other religions.
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The ancestors of living Native Americans arrived in what is now the United States at least 15,000 years ago, possibly much earlier, from Asia via Beringia. A vast variety of peoples, societies and cultures subsequently developed.