Question

Why did OPEC hit America with an oil embargo?

It had supported Egypt in the Yom Kippur War.
It was using more than its quota of gasoline.
It had issued an economic embargo of its own.
It had supported Israel in the Yom Kippur War.

Answer 1

It had supported Israel in the Yom Kippur War.

During the war, the nations that are part of the OPEC were surrounding Israel and were hostile towards Israel. In the area, Israel is the only nation that does not have a large amount of oil, and the US was affected by the oil embargo because of it's support. The nations in OPEC were trying to break the US support of Israel, but failed.

hope this helps