APUSH By zhangg 12,000 BCE Asians begin several migrations over Bering Strait Period: 12,000 BCE to 1492 Pre-Columbian Cultures 5000 BCE Maize cultivation begins in southern Mexico 700 BCE Olmec people flourish along Gulf of Mexico 100 Hopewell culture sets up massive trading network 300 Mayan city of Tikal features 20,000 residents and many temples 500 Teotihuacan's population reaches 100,000 at peak of culture