Answer:
In 1819, the United States and Spain signed the Adams-Onis Treaty, also known as the Transcontinental Treaty or the Florida Purchase Treaty. The treaty resolved a long-standing dispute between the two countries over the boundaries of their respective territories in North America. In exchange for renouncing any claims to Texas, which was then part of Spanish Mexico, the United States gained control of Florida and its ports. The treaty also established a clear boundary between Spanish and American territory west of the Mississippi River, with Spain ceding all claims to Oregon Country. Furthermore, it granted Americans the right to navigate the entire length of the Mississippi River and use New Orleans as a port without paying duties to Spain. This agreement helped to solidify American control over its southern borders and opened up new opportunities for trade and expansion in the region.
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