1. One of the possible theories is that humans crossed a land bridge that existed.
2. The large monuments and temples of the Olmet are evidence that the Olmec developed an advanced civilization that was capable of organizing large pools of labor.
3. Only a few Maya books on bark paper remain because some Spanish conquerors burned most of the books.
4. The main difference between the Aztec and Maya regarding the governing of their societies is that Maya lived in individual city-states while the Aztec were unified under one leader.
5. The Olmet influenced the Maya and the Aztec when they built the first Mesoamerican pyramids.
