The private profit motive dominated the movement westward, but the Federal Government played a supporting role in securing the land through treaties and setting up territorial governments, with governors appointed by the President. The federal government first acquired western territory through treaties with other nations or native tribes. Then it sent surveyors to map and document the land. By the 20th century Washington bureaucracies managed the federal lands such as the General Land Office in the Interior Department, and after 1891 the Forest Service in the Department of Agriculture. After 1900 dam building and flood control became major concerns.