would be in right now if it had not been for the application of fracking (an old technology) to unconventional oil. Conventional US oil production was in steep decline when the unconventional shale oil boom started. We'd be paying much higher prices at the pump if that had not been the case. See 2009-2010 in the linked graph.
https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=pet&s=mcrfpus2&f=m