The continents of north and south america were discovered by the european civilizations in the late 15th century ad but people from asia arrived in the americas at least 15000 years ago by the 15th century many american civilizations had come and gone long before but many were still vast and thriving. 1 the unknown story of ancient north america pyramids state of the art highways productive scientists artists and engineers these and much more were ancient north america but having left no written record and considered of no value by european conquerors many centuries later these societies seemed destined to remain a mystery. 10 fascinating facts about the first americans the first inhabitants of north american had arrived as early 35000 years previously probably having migrated from asia bridge to somewhere cape espenberg the northern tip of life for the indians of the plains changed dramatically after introduction of the horse to america by the . American indian member of any of the aboriginal peoples of the western hemisphere the ancestors of contemporary american indians were members of nomadic hunting and gathering cultures these peoples traveled in small family based bands that moved from asia to north america during the last ice age
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