Changes

===Oil===

===Oil===

Throughout the 1920s, new [[oil]] fields were continually discovered, and Oklahoma produced over 1.8 billion barrels of petroleum, valued at over 3.5 million dollars for the decade.<ref>Baird and Goble, ''The Story of Oklahoma'', (1994) p. 366</ref> In 1920, the spectacular Osage County oil field was opened, followed in 1926 by the Greater Seminole Oil Field. During the [[Great Depression]] Oklahoma and [[Texas]] oil was flooding the market, and prices fell to pennies a barrel. In 1931 Governor William H. Murray, acting with characteristic decisiveness, used the National Guard to shut down all of Oklahoma's oil wells in an effort to stabilize prices. From the 1930s to the 1970s, oil producing states enacted conservation laws which limited the amount of oil that could be produced from wells.  In practice, the [[Texas Railroad Commission]] set production quotas (called "allowables") in Texas, which raised prices as well for Oklahoma crude.  However, there are so many oil pipelines and oil storage facilities near Cushing, Oklahoma, that from that time until the present, the spot price of oil in Cushing is used as the trading benchmark for mid-continental oil generally.

Throughout the 1920s, new [[oil]] fields were continually discovered, and Oklahoma produced over 1.8 billion barrels of petroleum, valued at over 3.5 million dollars for the decade.<ref>Baird and Goble, ''The Story of Oklahoma'', (1994) p. 366</ref> In 1920, the spectacular Osage County oil field was opened, followed in 1926 by the Greater Seminole Oil Field. During the [[Great Depression]] Oklahoma and [[Texas]] oil was flooding the market, and prices fell to pennies a barrel. In 1931 Governor William H. Murray, acting with characteristic decisiveness, used the National Guard to shut down all of Oklahoma's oil wells in an effort to stabilize prices. From the 1930s to the 1970s, oil producing states enacted conservation laws which limited the amount of oil that could be produced from wells.  In practice, the [[Texas Railroad Commission]] set production quotas (called "allowables") in Texas, which raised prices as well for Oklahoma crude.  However, there are so many oil pipelines and oil storage facilities near [[Cushing, Oklahoma]], that from that time until the present, the spot price of oil in Cushing is used as the trading benchmark for mid-continental oil generally.

===Depression===

===Depression===