There were many reasons that allowed Hernan Cortes and other European explorers to overcome well-established Native American cultures with millions of people. First of all, a harsh tribute system contributed to made Cortes as savior. In addition, Mexican population had same views (human sacrifice) with Cortes. That led to creating Indian allies with Mexican tribes who opposed the Aztecs. Second, many diseases are transferred, such as small box, to Mexico by Spanish that led to die million of Aztecs and Indian allies. Third, Cortes had translators Marina and Aguilar. Marina knew the language Coatzacoalcos and Tabascans in addition to Spanish. Also she had a good education and she was smart. She contributed to gain Indian allies. Forth, religion