Answer:
Im pretty sure the answer is Checks and Balances
Explanation:
Because each branch has the power to stop another branch from doing something stoopid
Hope this helps! :)
I think that the answer is The west's natural resources gave settlers the chance to make money, It might be, Going west gave settlers a chance to improve their own lives also but I don't know......
The answer is 1901 AD - 2000 AD