The dockworkers’ strike at ports from Maine to Texas threatens economic shock waves hurting American consumers and inflicting political pain on the campaign of Vice President Kamala Harris.

Dockworkers walked out of every major port on the US East and Gulf coasts for the first time in nearly 50 years, staging a strike that could ripple across the world’s largest economy and cause political turmoil just weeks before the presidential election.

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