The Treaty of Mount Dexter, signed in 1805, was an agreement between the United States and the Muscogee (Creek) Nation that ceded a significant portion of Creek land in present-day Alabama to the U.S. government. This treaty was crucial in shaping Alabama's early land policies as it opened up areas for American settlement and expansion. It represented a pivotal moment in the United States' pursuit of territorial growth while impacting the lives and sovereignty of Native American tribes in the region.