Oh boy, you outlanders don't understand sarcasm
01) Aztecs - City-building civ from Mexico
02) Maya - City-building civ from Central America
03) Olmec - City-building tribe from Mexico
04) Toltec - City-building tribe from Central America
05) Carib - Large tribe which the Caribbean is named after
06) Inca - City-building civ from Peru
07) Tupi - Large tribe from Patagonia in S. America
08) Arawak - Large tribe in S. America
09) Moche - Large tribe from Northern S. America
10) Mapuche - Large tribe in Southern S. America
11) Chibcha - Large tribe from Northern S. America
12) Iroquois - Confederation of tribes around the Great Lakes
13) Cherokee - Large tribe from Southeastern US, major role in Anti-Colonialism
14) Leni-Lenapes - One of the first tribes encountered by England, around Chesapeake Bay
15) Choctaw - Large tribe from Georgia
16) Creek - Large warlike tribe inbetween Cherokee and Iroquois
17) Shawnee - Large tribe near Creek who moved western
18) Algonquin - Large tribe in Eastern Canada and US
19) Inuit - Expansive tribe from Alaska to Greenland
20) Sioux - Nomadic tribes in Northern US and Southern Canada
21) Apache - Nomadic tribe in Northern Mexico and Southern US
22) Navaho - Large tribe in New Mexico and Arizona
23) Nez Perce - Tribe all over Western US, fought Spanish
24) Ute - Large tribe which popularized Teepees and Utah is named after
25) Shoshone - Large tribe near Utes and Nez Perce
26) Haida - Anti-Russian large tribe along W. Coast of N. America
27) Commanche - Apache-like tribe in Texas and Mexico
28) Natchez - City-building tribe in Texas and Louisiana
29) Pomos - Largest Californian tribal group
30) Cree - Very large tribe in Canada
31) Cheyenne - Very important tribe in Mississippi area
Hope that helps you some. I could explain their significance but it's 2am and I'm tired.