Dockworkers at dozens of U.S. ports are digging in for a massive pay increase, seeking to flex their power in a strike that aims to strangle the flow of trade across much of the country.“This is going down in history what we’re doing here,

The union representing thousands of dock workers from Maine to Texas launched a strike Tuesday over wages and the use of automation, shutting down major seaports.

The contract between the ports and about 45,000 members of the International Longshoremen’s Association expired at midnight, and even though progress