The Louisiana War (Spanish: Louisiana Guerra) was a war fought between the United States and the Kingdom of Spain from 1845 to 1847 during the Springtime of Nations. The war concerned the status of the territory (and later republic) of Louisiana; for decades the land had been a territory of New Spain, but the land's inhabitants declared independence in 1845 during worldwide revolutions. Soon, the United States claimed the annexation of the republic, which was still considered a Spanish territory by the Spanish crown.