The USA had a Capitalist Economy. It is different from Cuba's economy because Cuba's Economy is Communist.
They became more populated. Some would say more pollution was in the air.
The Economy changed in many ways.
-Seth
I believe there are lots of reasons why the Roman Empire declined but the 3 most important ones are, Government corruption and political instability, Invasions by Barbarian tribes, and The rise of the Eastern Empire, but the one I think is the most important is the first one reason.
