Though it had been established in 1960, OPEC did not gain effective control over oil prices until 1970, when Libyan leader Muammar Gaddafi forced oil companies in Libya to agree to a price increase; other countries followed suit. U.S. leaders did not attempt to block these price increases, as they believed that higher prices would help increase domestic production of oil. This increased production failed to materialize, and by 1973 the U.S. consumed over one and a half times the oil that it produced domestically. In 1973, in response to the U.S. support of Israel in the Yom Kippur War, OPEC countries cut oil production, raised prices, and initiated an embargo targeted against the United States and other countries that had supported Israel. The embargo caused gasoline shortages and rationing in the United States in late 1973, but was eventually ended by the oil-producing nations as the Yom Kippur War peace took hold.