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First President - George Washington () Second President - John Adams () Third President - Thomas Jefferson () Fourth President - James Madison () Fifth President - James Monroe () Sixth President - John Quincy Adams () Seventh President - Andrew Jackson () Eighth President - Martin Van Buren () Ninth President - William Henry Harrison (1841) Tenth President - John Tyler () Eleventh president - James K. Polk () Twelfth President - Zachary Taylor () Thirteenth President - Millard Fillmore () Paleo Indians - the first Americans who crossed from Asia into North America sometime between 38,000 and 10,000 BC Berginia - Land bridge from last ice age Agriculture revolution - 10,000 years ago climate got warmer so everyone started farming Native Americans - Decendants to paleo indians. Over 650 groups Mesoamerica - Olmecs mayas toltecs and aztecs Olmecs - First great Mayas - Farners + raiders Aztecs - 5 million popukation. Conquered by spanish empire North American tribes - Adena, anasazi, hopewell, and mississippians South American tribe - Incas Incas - Peru. 12 million empire. 1530's conquered by spanish East-west trade - All sea trade route - Portugal -