As oil prices have taken their steepest plunge ever, energy producers from Mexico City to Moscow have felt the pinch. While some are suffering more than others, no major petroleum exporter has entirely escaped the pain. A look at the economic and political woes that cheap oil is causing once mighty producers around the world:
LATIN AMERICA. Mexico is No. 1 on the list of endangered energy exporters. It earns 70% of its foreign exchange from the sale of oil, and this year's price declines will slash revenues by about $6 billion. That could make it virtually impossible for the cash-strapped...