American pioneers, were European Americans, African Americans, Hispanic/Latino Americans, and Asian Americans, who settled the Western United States. The majority of the European-American and African-American settlers had marched west from the British Thirteen Colonies and later the United States of America, to settle and develop areas of the nation within the continent of North America. Others migrated north from Latin America and east from Asia.
The pioneer concept and ethos greatly predate the settlement of the Western United States, with which they are commonly associated, and many places now considered "East" were settled by pioneers from even further east. For example, Daniel Boone, a key figure in U.S. history, settled in Kentucky, when that "Dark and Bloody Ground" was still undeveloped.