Which Spanish conqueror defeated the Aztecs and claimed Mexico for Spain?

Hernando Cortés is the Spanish conqueror who is credited with defeating the Aztecs and claiming Mexico for Spain. His expedition began in 1519, and he capitalized on various factors such as forming alliances with enemy tribes of the Aztecs, exploiting the political divisions within the Aztec Empire, and taking advantage of the technology and weaponry that the Spanish had over the indigenous peoples.

Cortés and his men ultimately captured the Aztec capital of Tenochtitlán in 1521, leading to the fall of the Aztec Empire. This conquest marked a significant moment in the expansion of Spanish influence and colonization in the Americas, fundamentally transforming the region's cultural and political landscape.

In contrast, Francisco Pizarro is known for his conquests in South America, particularly against the Inca Empire. Juan Ponce de León explored parts of Florida and is famous for his search for the Fountain of Youth, while Francisco Vázquez de Coronado led expeditions in the American Southwest. Hence, these figures are associated with different regions and explorations, making Cortés the only correct answer regarding the conquest of the Aztecs in Mexico.