What did the Adams-Onis Treaty accomplish?

The Adams-Onis Treaty, also known as the Transcontinental Treaty, was significant because it formally ceded Florida from Spain to the United States. In this agreement, the U.S. essentially traded its claims to Texas, where Spain still held territory, in exchange for Florida. This treaty not only expanded U.S. territory significantly but also helped to clarify the boundaries between U.S. and Spanish lands, contributing to future U.S. expansion. The agreement reflected the U.S. government's goals to assert itself in North America and eliminate any potential Spanish presence in the region.

The other options do not correctly describe the treaty's outcomes or scope. For instance, conflicts over the Ohio River Valley were addressed earlier, during the Treaty of Paris (1783), and not by the Adams-Onis Treaty. Similarly, while establishing trade routes to Asia was a goal for many during this era, the treaty itself did not directly achieve such an initiative. The matter of slavery in newly acquired territories was more directly addressed by future legislation and compromises, notably the Missouri Compromise, rather than through the Adams-Onis Treaty. Thus, the proper context for the Adams-Onis Treaty focuses on the Gains of Florida and the border corrections it provided.