Answer:
Rise and Fall of Maya Civilization Over 3,000 Years.
Explanation:
Since Mayan culture formed, dissolved and reformed over many hundreds of years, scholars divide the years into three main time periods: Pre-Classic (2000 B.C. to A.D. 250), Classic (A.D. 250 to 900) and Post-Classic (900 to 1519)
Because they can build something for everyone not just help poor lazy people this benifits everyone in stead of a single group of people
The Soviet Union didn't fall until 1991.
Slash and burn agriculture would have been practiced most prominently in the river valleys of Egypt, since this is were lots of plant life existed, which needed to be eliminated to make room for fields.
Khanacademy.org overview hope this helps :)
