The 10 most oil-rich states

The U.S. energy industry is booming. As new technologies make oil easier and more affordable to extract, the United States is poised to become the world’s leading oil producer as soon as 2015, according to a 2013 study by the International Energy Agency. At the same time, proven oil reserves — the estimated quantities of oil that can be extracted under existing conditions — have also risen. In 2012, the U.S. had more than 30.5 billion barrels of proven oil reserves, up 15% from the year before.

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