The "Northwest Territory" category of books encompasses a range of literary works that are set in or revolve around the historical region known as the Northwest Territory, which was a large area of land west of Pennsylvania, northwest of the Ohio River, east of the Mississippi River, and south of the British territories in Canada. This category could include historical fiction that brings to life the early American frontier experience, non-fiction accounts of the exploration and settlement of the territory, biographies of key figures involved in its development, and studies of the Native American tribes that inhabited the region. The books within this genre would likely explore themes such as colonial expansion, the impact of the Northwest Ordinance of 1787, the challenges of frontier life, and the cultural interactions and conflicts between settlers and indigenous peoples. The category may also delve into the ecological and geographical aspects of the area, which now encompasses states such as Ohio, Indiana, Illinois, Michigan, Wisconsin, and parts of Minnesota.

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