Aterm used to describe unsettled land or territory west of the existing colonies. people that traveled to settle these areas were called pioneers. term: type term here

A frontier is essentially the term which is used to portray the land that lies past a settled geographic locale or region or we can say that frontier is the idea of a place that exists at the edge of a human progress, especially during a time of extension. The American frontier happened all through the seventeenth to twentieth centuries as Euro-Americans which are colonized and extended crosswise over North America.

the answer would be c

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