The biggest dockworker strike in almost half a century is on its third day. If talks continue to stall for weeks, delaying the unloading of goods, it could spell trouble for at least one major retailer in Texas.

The union representing U.S. dockworkers has signaled that 45,000 members will walk off the job at midnight, kicking off a massive strike likely to shut down ports across the East and Gulf coasts.