Yes, the Sioux Native Americans made contact with the tribes around them for trade, and other purposes. I have done research projects on the Sioux, so I know a descent amount about them, hope this helps! :)
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US President Lincoln commuted the death sentences of 260 Native Americans who had been captured during the Great Sioux Uprising of 1862. Many other Native Americans were killed in the conflict. On one day alone, the largest mass execution of Native Americans took place in 1862. Thirty eight Native Americans were hanged on December 26, 1862.
Because the different tribes lived largely independent of each other, so Native Americans in Oregon didn't have contact with Native Americans in Delaware, thus their cultures and languages formed entirely separate from each other.
The Sioux tribe lived in tepees like the other Native American tribes.
A reservation is a kind of ghetto or enclave, in which native Americans associate only with their fellow native Americans in the reservation and have relatively little if any contact with other types of Americans. If native Americans move to cities where other types of Americans live, they will become more involved with what I might loosely describe as mainstream American culture. That is assimilation.
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Sioux were hunter gatherers whose diet consisted mainly of corn, fruit, wild rice, fish, deer, and buffalo. They also often had wars with the Ojibwa which caused them to eventually occupy other areas. Sioux Native Americans were also well known for their celebrations that often included dancing, singing, and eating.
If you mean Native American groups, there currently are the Turtle Mountain Chippewa, the Standing Rock Sioux, the Spirit Lake Sioux, the Hidatsa, the Mandan, and the Arikara. Other native groups could be animals, plants, soils, etc.
When the Native Americans arrived, approximately 10,000 years ago, no other human beings were living in the Americas.
The USA Government does not release the numbers on Native Americans. They do on Asians, and other nationalities.