In 1973 OPEC countries imposed an oil embargo to retaliate for US support of Israel during the Yom Kippur War. Drivers endured soaring gasoline prices, blocks-long lines, hours wasted waiting to refuel vehicles, and restrictions on which days they could buy fuel. America was vulnerable to those blackmail sanctions because we imported “too much” oil – though it was just 30% of our crude.

The fracking revolution (horizontal drilling and hydraulic fracturing) and other factors changed that dramatically. The United States now produces more crude oil than at any time since 1970.

But now we face new, potentially far greater danger