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The Pre-Columbian era incorporates all period subdivisions in the history and prehistory of the Americas before the appearance of significant European influences on the American continents, spanning the time of the original settlement in the Upper Paleolithic period to European colonization during the Early Modern period. While the phrase pre-Columbian era literally refers only to the time preceding Christopher Columbus's voyages of 1492, in practice the phrase is usually used to denote the en
In 1871 Congress added a rider to the Indian Appropriations Act, signed into law by President Ulysses S. Grant, ending United States recognition of additional Native American tribes or independent nations, and prohibiting additional treaties.n the United States, Native Americans are considered to be people whose pre-Columbian ancestors were indigenous to the lands within the nation's modern boundaries. These peoples were composed of numerous distinct tribes, bands, and ethnic groups, and many of these groups survive intact today as sovereign nations.