6.) Bartolomé de las Casas
9.) Ecomienda?? Not sure on this one, though that wasn't for Native Americans.
10.) Cahokia!!
3.) Thomas Morton (Had to look this up. http://che.umbc.edu/londontown/docs/NativeAmericansintheChesapeake.pdf BOTTOM)
I don't know any other ones, hope I helped to a certain extent.
Answer: Pretty simple
Explanation: Lets look at Africa closely. You can see that they have a pretty simple system
They could no longer trade with the United States because of the depression there
The Louisiana Purchase opened up the United States at the time to the Midwest
