Can the conquest of one city change the world? In 1519, two powerful empires - Spain and Mexica (Aztec) - were hungry for expansion in central Mexico. Led by emperor Motecuzoma II, the Mexica people had subdued their native enemies and now controlled a sprawling territory with the great city of Tenochtitl?n at the center. Then the Spanish conquistador Hern?n Cort?s led an attack on the Mexica empire. Although the Spaniards had horses and guns, both...