Why Are These Massive Cargo Ships Trapped at 29 U.S. Ports?Kelsey Campbell-Dollaghan2/19/15 5:00pm33639EditPromoteGo to permalinkYou've probably read about it, even if it didn't really register. Something about a backlog. Something about unions. Imports and exports. Now the dispute that's paralyzing 29 ports on the U.S. West Coast has the potential to affect all of us—and to empty the shelves in countless stores.