I think the sugar act mainly affected the American colonies.
Thousands of slaves served on both sides of the war, in the end they ended up winning their freedom after the British and the Colonists that slaves could serve an important role during the revolution.
St. Louis, Missouri but was raised in St. Paul Minnesota
Mississippi River flows into the Gulf of Mexico - so that's how I know that the correct answer is c!
There is also a Rio Grande that flows into the same Gulf, but there are actually many rivers of this name, as it just means "Big River" in Spanish.