Oil

Two giants team up for a combo the likes of which hasn't been seen since ExxonMobil.

ExxonMobil profits are down 21 percent, so company curtails jobs and investments.

In response to low oil prices, oil companies may cut back exploration projects.

Why does gas costs about 50 percent more in New York than Missouri? It's complicated.

"Grain cars were unhooked so the locomotives could hook onto oil," one farmer says. Dakota railroads tell another story.

Energy states have tried to diversify. Wyoming and Alaska remain highly reliant on oil revenue.

During 2014, oil prices dropped by half. Except more of the same in 2015.

A lousy crop means high prices. At least for the real thing.

Oil, whose price has halved in the past year, accounts for 95 percent of the country’s exports and 45 percent of the government’s budget.