Many ports along the East and Gulf coasts were shut down, threatening the country’s supply chains, after unionized port workers went on strike on Tuesday. But those workers will return to work after reaching a tentative agreement on wages with the group representing port employers.

A strike by dockworkers at dozens of U.S. ports has paralyzed about half of the country’s ocean shipping, and a prolonged dispute could bring the issue close to home for consumers. The strike, which includes about 45,