USA HISTORY

Detailed explanation-1: -This is usually referred to as the trans-Mississippi frontier. The region faced by the American pioneers in this last advance was different in character from anything that they had met before, and the frontiers that emerged were more varied and more colourful than any earlier environments had produced.

Detailed explanation-2: -The frontier is the margin of undeveloped territory that would comprise the United States beyond the established frontier line. The U.S. Census Bureau designated frontier territory as generally unoccupied land with a population density of fewer than 2 people per square mile (0.77 people per square kilometer).

Detailed explanation-3: -American frontier, in United States history, the advancing border that marked those lands that had been settled by Europeans. It is characterized by the westward movement of European settlers from their original settlements on the Atlantic coast (17th century) to the Far West (19th century).

Detailed explanation-4: -The idea of a “frontier, ” of a place that is an edge between the known and the unknown, the settled and the wild, has a prominent place in American history. Sometimes it is a particular territory, such as the North American continent west of the Missouri River.