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 dockworkers’ strike, their first since 1977, could snarl supply chains and cause shortages and higher prices if it stretches on for more than a few weeks. Beginning after midnight, the workers walked picket lines Tuesday and carried signs calling for more money and a ban on automation that could cost workers their jobs.