During what century did Euro-American expansion initially reach throughout the entire continental United States such that they occupied most Native American lands?

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Euro-American expansion throughout the entire continental United States, leading to the occupation of most Native American lands, primarily occurred during the nineteenth century (1800s). This period saw significant westward expansion, including events such as the Louisiana Purchase, the Trail of Tears, and the California Gold Rush.

During What Century Did Euro-American Expansion Initially Reach Throughout the Entire