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In page Montgomery County, Kansas:

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When Kansas was admitted to the Union as a state in 1861, the Osage Indian reservation occupied a large tract of land near the southern border. The reservation had been established in 1825. After the Civil War ended, the Osage lands were coveted as the largest and last reserve of good land in the eastern part of the state. As early as 1866, the Osages were forced to cede tracts at the eastern and northern edges of the reservation. This treaty conceded white settlement on land in the eastern part of what is now Montgomery County.[citation needed]