Answer:
D
Explanation:
Boxer Day, St Patrick's Day, Valentine's Day, Ramadhan, and Yom Kippur are not national U.S. holidays. Therefore, the answer must be D.
Colonial era: british
WW1: American
WW2: British (America for the atom bomb... but thats just one weapon. and they massed produced everything else really)
after that: AMERICA!!
Answer: To help Africa America adjust to life after slavery
Explanation: