The dreaded time came when the Spanish arrived in the Aztec civilization. They did not know what the Spanish would do until it actually happened. The Aztec fell near 1521 because that is when the Spanish came. It only took the Spanish 3 years to defeat the Aztec. Also, the god Quetzacoatl was expected to return. The god Quetzalcoatl, is the Feathered Serpent or Precious Twin. He is the god intelligence and self-reflection, a patron of priests. He was considered the White God. The Aztec believed that the Spanish were gods and that is why they respected them so much. They also were shocked by their horses because they had never seen them before. The Spanish planned a sneak attack and attacked the Aztec. The Spanish had metal guns, swords, and diseases. That is how the Aztec civilization ended before they even knew it.