What did the leaders of OPEC realize
after the resolution to the oil embargo
in 1974?
A. The U. S. is self-reliant.
B. The U. S. won't back Israel.
C. The U. S. weakness is oil.
D. The U. S. does not need
OPEC.

D. The U.S. does not need  OPEC.

Explanation:

The embargo caused the United States and western European countries to reassess their dependence upon Middle Eastern oil. It also led to far-reaching changes in domestic energy policy, including increased domestic oil production in the United States and a greater emphasis on improving energy efficiency.

(I may be wrong but I believe that this is right)

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.