Pandemic and war have upended American supply chains. The next shock may come from the U.S. campaign against human-rights abuses in China.

President Biden defended his administration’s response to a national baby formula shortage, saying he acted as soon he became aware of the crisis in April — even as manufacturers told him Wednesday they saw it coming months earlier.

As the U.S.’s largest ports in California moved record amounts of cargo amid pandemic-induced supply chain bottlenecks, union dockworkers strengthened their indispensable role in the nation’s logistics network.