When did Spain lose Texas?
When did Spain lose Texas? The Adams-Onis Treaty in 1819 ended this border dispute, but Spain lost possession of Texas in 1821 after Mexico won its independence from Spain.
Who owned Texas before Spain?
In 1762, France finally relinquished their claim to Texas by ceding all of Louisiana west of the Mississippi River to Spain as part of the treaty to end the Seven Years' War.
Why was Mexico angry about Texas?
Mexicans had overthrown the Spanish and wanted to prove they were capable of running all the territory they had won from Spain. Mexico also feared a domino effect—that giving up Texas would lead to the loss of their other northern territories.