In the 1970's 85% of the oil used in the US was produced here and 25% was imported. Today it has been reversed. There are many grades to oil and some of the oil imported is a crude oil from the Middle East . Part of the reasons for imported oil are profits for the oil companies, trade agreements, and GNP.
the percent of venezuelan oil that is used in the us is 10 percent
The largest oil reserves in the United States of America are in Alaska. These oil reserves are not used as a main source of oil in the US.
57%
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Approximately 33% of our oil is produced domestically. I used the most current data from the US Department of Energy, Energy Information Agency, which is an excellent site for information. There has been a long term declining trend to our domestic oil supply. For the first 8 months in 2008, US oil production has been about 5.1 million barrels per day, while imports have about 10 million barrels per day. I ignored Sept 2008 data as hurricane activity made the data anomalous. See: http://tonto.eia.doe.gov/dnav/pet/pet_sum_crdsnd_adc_mbbl_m.htm
Oil
the ground
from Dec 1941 to Aug 1945
The US produces about 2 billion barrels of crude oil annually.
John D. Rockefeller of the Rockefeller company controlled US oil production for a long time.