On which date did Louisiana achieve statehood as the 18th American state?

Louisiana achieved statehood as the 18th American state on April 30, 1812. This date is significant in American history as it marks the transition of Louisiana from a territory to a fully recognized state within the Union. The admission of Louisiana was part of the broader westward expansion and development of the United States, and it followed the Louisiana Purchase in 1803, which greatly expanded U.S. territory. This event showcased the growing influence of the United States and the integration of diverse cultural and geographic regions into the nation. Louisiana's statehood was a pivotal moment as it contributed to the complexities of the political landscape of the time, especially regarding issues such as representation, governance, and the integration of new populations.

Other dates in the options refer to different historical contexts, such as treaty signings, demographic changes, or significant events in U.S. expansion efforts, but they do not coincide with the official recognition of Louisiana as a state.