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It was 40 years ago this weekend that Saudi Arabia shocked the United States by suddenly cutting off all direct oil shipments in retaliation for U.S. support of Israel. Other Arab countries followed. That 1973 oil embargo forced Americans to start thinking differently about our dependence on imported oil. Four decades later, the U.S. is in the midst of an energy boom here at home, as NPR's Scott Horsley reports.

SCOTT HORSLEY, BYLINE: The 1973 oil embargo was a rude shock for a country that had long taken cheap and plentiful oil for granted. Prices soared, gasoline lines stretched for blocks, and Richard Nixon became the first of many U.S. presidents to call for energy independence.

PRESIDENT RICHARD NIXON: Whenever the American people are faced with a clear goal, and they're challenged to meet it, we can do extraordinary things.

HORSLEY: One outgrowth of that '73 embargo was a new bipartisan group in Washington dedicated to energy efficiency. The Alliance to Save Energy is still around four decades later. President Kateri Callahan says there has been a lot of progress.

KATERI CALLAHAN: Since the 1970s, our economy has doubled its energy productivity. We're producing twice as much for each unit of energy that we use.

HORSLEY: But the commitment to efficiency has been uneven, rising and falling with the price of gasoline. When gas prices tumbled in the 1990s, Americans traded in their fuel-efficient cars for SUVs. Callahan says the U.S. still lags other developed countries in its energy efficiency gains.

CALLAHAN: We have a flurry of activity and then because of cheap oil and easy and abundant resources, we were lulled into complacency. So it takes a crisis to mobilize the United States unfortunately.

HORSLEY: After dipping during the recent recession, crude oil prices are now back around $100 a barrel and Americans are rediscovering the benefits of fuel efficiency. Two years ago, automakers agreed to develop cars that will go twice as far on a gallon of gas by 2025. In the meantime, America has witnessed a revolution on the supply side, thanks to advances in drilling techniques such as fracking, that allow producers to reach previously untapped shale deposits.

Rayola Dougher of the American Petroleum Institute says since bottoming out five years ago, domestic oil production has come roaring back.

RAYOLA DOUGHER: It's been a stunning reversal of fortune in terms of the amount of oil and natural gas we're able to bring to the market. Last year we brought on a million new barrels a day which is the biggest increase we've ever done in the history of the United States.

HORSLEY: This year the U.S. is expected to surpass Russia as the world's largest producer of oil and natural gas. Economic historian Daniel Yergin, who writes about energy in his books, "The Prize," and "The Quest," says the boom in homegrown oil and gas is supporting more than 2 million jobs, while saving money for consumers on their electric bills.

DANIEL YERGIN: What's happened with oil and gas has been the most positive thing to happen in our economy since the downturn began in 2008.

HORSLEY: President Obama took note of the turnaround during a White House news conference last week.

PRESIDENT BARACK OBAMA: This year, for the first time in a very long time, we're producing more oil than we're importing, so we've got a lot of good things going for us.

HORSLEY: U.S. reliance on imported oil has dropped from 60 percent eight years ago to less than 40 percent today. Historian Yergin was thinking about that change as he watched the messy debt ceiling drama unfold in Washington this week.

YERGIN: Turns out you can get natural gas out of shale but the rock out of which we shape our national politics seems even harder and more difficult to deal with.

HORSLEY: Forty years ago it took a group of hostile foreign oil producers to bring the U.S. economy to its knees. Today, our biggest economic shocks are likely to come from our own leaders. Scott Horsley, NPR News, Washington.

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