George Rogers Clark captured the west from the British
It was primarily the "b. formation of the Vietcong in Vietnam" that led the Truman administration to expand the containment doctrine to include Asia, since this was seen as a threat to democratic principles in the west as well.
The federal government wanted to assimilate and introduce the natives to the American way of living and to integrate them into the society.
The populist party tried to set rates that were fair for farmers to ship their goods to market. Railroad barons were setting their own price.