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The Aztecs of Mexico built the largest and most powerful empire in the Pre-Columbian world. The Aztec Empire encompassed most of what is central and southern Mexico today and its influence spread beyond the Rio Grande River in the north and into the rain forests of central America to the south. In many ways, the structure of the Aztec Empire was not unlike that of old world pre-modern societies, especially those from the Bronze Age, but the fundamental difference was that it was driven by a unique combination of warfare and human sacrifice. The Aztecs were by far the best and most organized warriors of the region and the nearly constant wars they waged were not only to spread the geographic limits of their empire, but also to acquire more captives for human sacrifice, especially for the warrior god Huitzilopochtli.