The 19th century frontier, as technically defined in census ...

[sarasara]

The 19th century frontier, as technically defined in census reports, was any area
 a. west of the Appalachian Mountains.
  b. containing more than two and less than six people per square mile.
  c. without a sheriff and recognized local government.
  d. that had not been surveyed according to provisions of the Land Ordinance of 1785.

Question 2

In the 1920s, American (non-farm) labor benefited from all of the following except:
 a. low unemployment rates.
  b. falling weekly work hours.
  c. legal limits on immigration.
  d. passage of federal minimum wage legislation.

[joshraies]

Answer to Question 1

b. containing more than two and less than six people per square mile.

Answer to Question 2

d. passage of federal minimum wage legislation.