Answer:
1. Archaeologists call these earliest people in the Americas Paleo Indians or Paleo Americans.
Paleon Indians or Paleo Americans are the name given to the peoples who first inhabited the American continent, arriving from Siberia, crossing the Boering Strait, which at the time was frozen and thus worked as a land bridge.
According to most estimates, these Paleo Americans arrived in the continent 16,000 - 12,000 years ago, although there is significant disagreement among some scholars over the exact time period.
2. The civilization that succeeded the Olmec were the Mayans.
The Mayans are one of the three main American civilizations, along with the Aztecs, and the Incas. The Mayans inhabited what is now the Peninsula of Yucatan in Mexico, Guatemala, and Honduras, and were an important civilization not only in economic and military terms, but also in terms of scientific development, especially in the field of astronomy.
There were more jobs in the cities, if everyone worked on a farm there wuld be more than billions of grocery stores, then they would be wasting food because not everyone would buy evrything!
<em>Civil wars and foreign invasions showed that the empire had become too large to be ruled by one person.</em> :-)
A widespread disease that killed many people
the split of the Christian church
invasion from Arab Muslims
