Region
America
1
American Bottom (Ill.)
1
Andes
1
Cahokia Mounds State Historic Park
1
Cahokia Mounds State Historic Park (Ill.)
1
California
1
Canada
1
Delaware
1
Etats-Unis
1
Europe
1
États-Unis
2
Grandes Plaines
1
Great Basin
1
Great Plains
2
Illinois
1
Kansas
1
Middle West
1
New Mexico
3
New Southwest
1
New York (State)
2
New York (State)$zNew York
1
North America
2
Northeastern States
1
South America
1
Southern States
1
Southwest, New
6
Southwest, Old
1
United States
8
United States, Iowa
1
West (U.S.)
1