Aboriginal Americans of the continental United States, including the Aboriginal people of Alaska, had migrated from northern Asia by taking advantage of the freezing in the waters of the intersection of Russia and the state of Alaska. They started emigrating to the United States at least 12,000 years and possibly as far as 40,000 years ago. Some indigenous communities during the pre-Columbian period developed advanced agriculture, great architecture, and state-level societies. Explorer Christopher Columbus arrived in Puerto Rico on November 19, 1493 and made first contact with the Native Americans. Years later, the majority of Native Americans were killed by the Eurasian epidemic.
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