By John M. Broder


LOS ANGELES, July 26 - Severe cargo congestion and labor shortages at American seaports are creating long delays in delivering goods and potential threats to national security, dockworkers and security experts say.

The problems are particularly acute at the ports of Los Angeles and Long Beach, the nation's busiest, handling roughly a third of the nine million cargo containers that arrive in the United States each year ......
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