The answer would be C. St. Louis.
St. Louis was given this nickname during the 1800s when it acted as a starting point for settlers during the westward movement.
D it was challenging
Explanation:
Bc im awesome <em>Lol</em>
Checks and balances help balance the U.S. government power (the three branches). Each branch's powers are kept in check by the powers given to the other two branches.
