When did the Aztecs surrender to the Spanish?

The Aztecs surrendered to the Spanish on August 13, 1521, after a prolonged siege led by Hernán Cortés. The fall of Tenochtitlán, the Aztec capital, marked the end of the Aztec Empire and the beginning of Spanish colonization in Mexico. The surrender followed months of fierce fighting and significant loss of life due to warfare and diseases brought by the Europeans.