The Deepwater Horizon oil rig that exploded in the Gulf of Mexico was built in South Korea. It was operated by a Swiss company under contract to a British oil firm. Primary responsibility for safety and other inspections rested not with the U.S. government but with the Republic of the Marshall Islands -- a tiny, impoverished nation in the Pacific Ocean.
And the Marshall Islands, a maze of tiny atolls, many smaller than the ill-fated oil rig, outsourced many of its responsibilities to private companies.
Now, as the government tries to figure out what went wrong in the worst environmental catastrophe in U.S. history, this international patchwork of divided authority and sometimes conflicting priorities is emerging as a crucial underlying factor in the explosion of the rig.