The Spanish campaign against the Aztec Empire had its final victory on 13 August 1521, when a coalition army of Spanish forces and native Tlaxcalan warriors led by Cortés and Xicotencatl the Younger captured the emperor Cuauhtemoc and Tenochtitlan, the capital of the Aztec Empire.
The doctrine that allowedpeopleliving in the territories to decide the issue of slaverythrough their governmentalbodies was called popular sovereignty.
