The 19^th century frontier, as technically defined in census reports, was any area

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The 19th-century frontier, as defined in census reports, was technically any area containing more than two and less than six people per square mile. This definition was used to identify the boundary of settled land and the beginning of the frontier, based on population density rather than geographical landmarks or legal/administrative status.

The 19th Century Frontier, as Technically Defined in Census Reports

The 19^th Century Frontier, as Technically Defined in Census Reports