--wisegeek and wikipedia
Land became the main problem between the Europeans and the Indians. Settlers wanted land for farming and mining. As time went on, more and more Indians were forced off their land as new settlers arrived and travelled west.
At first settlers and Indians were friendly towards each other but when they started to protect their land fighting broke out. In 1830 a law was passed that allowed the government to move Indian tribes to the land west of the Mississippi.
When gold was found in California in the 1850s settlers rushed west as quickly as possible and destroyed the land that the Indians depended on for hunting and fishing.
At the beginning of the 20th century the American government started putting Indian tribes on reservations in the western part of the United States. That program fails when valuable resources are discovered on 'Indian reservations'. Similarly there is failure when the American government reneges promises. The Dakota pipeline, for example, crosses disputed Sioux land that was promised to the tribe in the 1851 Treaty of Fort Laramie but was later taken away.
About 2.5 million Native Americans live in the USA today. The biggest tribes are the Cherokee, Chippewa, Navajo and Sioux. About a third of the Indians in the US live on reservations where 'Indian culture' is still preserved to the largest extent they are able.
Native Americans still face many problems in today’s America. Unemployment on reservations is about 50%. The income of an Indian family is much lower than that of a white family. Suicide rates are higher than in other places. Some Indians try to reduce their problems by drinking alcohol and taking drugs.
The Oceti Sakowin Camp is a historic gathering of tribes, allies, and people from all walks of life standing in solidarity to halt the Dakota Access Pipeline.