美国建国初期印第安保留地很大，水草丰美，适宜种植；如今的保留地狭小，专挑出来的，都是沙漠、荒滩，没有承载力，很适合压缩印第安人口。

When the US was founded, Indian Reservations were, though secondary to the eastern thirteen states, still fertile lands rich in water resources and suitable for grazing sheep and tilling. But with the WASP expansion westward, Indians were forced into deserts as reservations. Those deserts are suitable for nothing. This can squeeze Indian population to their minimal size.

Indian population has shrunk from 100 million before Mayflower landing to today's 4 million. If Mayflower had never arrived, Indian population might be 320 million today. But the 320 million people are Anglo-Saxons.