The answer to 10 is president Rutherford B. Hayes.
The answer to 11 is Graft.
The answer to 12 is political machine.
The answer to 13, 14 and 19 is e) Chinese Exclusion Act.
The answer to 15 is d) nativism.
The answer to 16 is b) melting point.
The answer to 17, 18 and 20 is a) Ellis island.