Yes also the unrestricted submarine warfare!
OPEC was protesting because the U.S. was supporting the Israeli military leader during the Yom Kippur War.
A primary source is a person (or a record produced by a person) who was actually there, as a witness or a participant of the event in question. A secondary source is someone who obtained information from a primary source and who then wrote or spoke about it.
I am sure it is control the money supply and manage economic growth
