An industry built on cheap debt and new technology pushed oil production to a 40-year high.
BLOOMBERG.COM

In January 2012, I traveled to Oklahoma City for the first time to report on what was considered a surprising development: a U.S. oil boom. Until then, hydraulic fracturing—aka fracking—was best known for boosting U.S. natural gas production. It was just starting to be used to unlock oil trapped in deep underground layers of rock like the Bakken Shale in North Dakota, the Eagle Ford in Texas, and the Mississippi Lime in Oklahoma.

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