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,

Transportation and warehousing sectors are poised to first feel the pinch, with a broader economic fallout expected if the strike drags on.

The strike by 45,000 members of the International Longshoremen’s Association has shut down Boston and 35 other seaports on the US Atlantic and Gulf coasts, which handle about half of all US seaborne trade.

Tens of thousands of dockworkers are on strike after the International Longshoremen's Association and the US Maritime Alliance failed to agree.

The union representing U.S. dockworkers 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

JPMorgan estimates the economic loss from the shutdown of every major container port from Houston to Miami and New York-New Jersey will be between $3.8 billion and $4.5 billion per day.

The strike, affecting every major port on the East Coast and Gulf Coast, will potentially cost billions and cripple the United States supply chain. The post A dockworker strike in Boston is looming. Here’s what to know.

The coming work stoppage threatens to significantly snarl the nation's supply chain, potentially leading to higher prices and delays for households and businesses if it drags on for weeks.