They were able to unite because the Persian invasion of Greek mainland was a common threat for all, so they united to stop it. This was impossible before because Persia was not considered to be such a major threat.
the Mexican government believed they would benefit because they would get more land and more profit
The 3 answer are:
1.) People moved around alot
2.) Trash was spread out over a large area
3.) Little surplus food was available
D. The Plymouth colonists did not settle in the area specified in their charter, so they wrote their own governing rules
