The "Westward Expansion Territories" category encompasses a collection of books that delve into the historical period of American growth from the late 18th century through the 19th century, when the United States expanded westward across the North American continent. This genre explores the acquisition, exploration, and settlement of territories beyond the original Thirteen Colonies, including the Louisiana Purchase, the Oregon Trail, and the California Gold Rush. It covers a wide array of narratives, from the experiences of pioneers and homesteaders to the impact of expansion on Indigenous peoples and the environment. These books often blend elements of adventure, conflict, and the transformative nature of the American frontier, providing readers with a multifaceted look at the political, social, and cultural dynamics that shaped the nation's manifest destiny and its evolving identity.

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