What year was the frontier declared closed

Frederick Jackson Turner and the frontier. A year after the Oklahoma Land Rush, the director of the U.S. Census Bureau announced that the frontier was closed. The 1890 census had shown that a frontier line, a point beyond which the population density was less than two persons per square mile, no longer existed.

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monitor contract compliance and results of forestry activities to assure adherence to government regulations.  

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(d) take jobs from american workers.