<P> As automobiles became more affordable, demand for oil quickly rose . Since the rise of the automobile industry, oil price, demand, and production have all increased as well . Between 1900 and 1980, fuel was directly correlated with Gross National Product (GNP). Furthermore, oil shocks have often coincided with recessions, and the government has responded to oil shocks in several ways . In the 1920s, oil prices were peaking and many commentators believed that oil supplies were running out . Congress was confronted by requests to augment supplies, so a generous depletion allowance was enacted for producers in 1926, which increased investment returns substantially . This change induced additional exploration activity, and subsequently the discovery of large new oil reservoirs . </P> <P> The next decade the situation was reversed, with prices low and dropping . This resulted in demands for more "orderly" competition and set minimum oil prices . Rather than repealing the previous policies enacted in the 1920s, Congress enacted a price - support system . Similar cycles have occurred in the 1950s and' 70s . </P> <P> Natural gas was the largest source of energy production in the United States in 2016, representing 33 percent of all energy produced in the country . Natural gas has been the largest source of electrical generation in the United States since July 2015 . </P> <P> The United States has been the world's largest producer of natural gas since 2009, when it surpassed Russia . US Natural gas production achieved new record highs for each year from 2011 through 2015 . Marketed natural gas production in 2015 was 28.8 trillion cubic feet, a 5.4% increase over 2014, and a 52% increase over the production of 18.9 trillion cubic feet per day in 2005 . </P>

Where does most of the us produced oil come from