Answer:
Answer of first part: OPEC is the organization of Arab Petroleum Exporting Countries which enacted an embargo towards the country which were helping Israel in the Yomp Kippur war in 1973. They decided not to sell oil to these countries as thinking these countries were supplying arms to Israel.
Among these countries UK, USA, Portugal, Canada, Japan , Netherlands.This oil embargo was known as the Oil Crisis of 1973 which had great impact on the global economy.
Nixon's response: The oil embargo by OPEC had a tremendous effect on the US oil market. Nixon found that America is too much dependable on the oil import. Their domestic production was far from meeting the demand.
So, he announced November 7, 1973 President Nixon announce the Project Independence for promoting the domestic energy independence.
Moreover, before that announcement President Nixon declared the new energy strategy to boost the domestic production which will reduce their dependence on the import of oil.
Step-by-step explanation: