The United States has vast reserves of oil and this has been known for several decades.
The problem with developing these resources is that they have to be able to sell the oil for 40 - 60 dollars per barrel to be profitable.
During the 80s the oil companies invested in US production due to the oil shortages of the 70’s only to see the Saudis crash oil prices to below 20 dollars per barrel.
For a decade or so it was much cheaper to deplete Saudi oil reserves at rock bottom prices per barrel.
World demand is such that it is now the time to develop US domestic reserves
with cheaper energy then we could be making things in America as we have more oil than other countries , much more oil than China too. cheap energy can power factories etc. it's the EPA, obama , democrats and their gov regulations and environmental laws holding us back.