As the shipping industry pushes for more automation at West Coast ports, the powerful union representing dockworkers is fighting back, saying robots will only kill good American jobs.

"Americans went on a shopping spree as soon as lockdown started, and we haven't really stopped," journalist Christopher Mims says. His book, Arriving Today, goes inside the global supply chain.

Delayed containers are a symptom of and contributor to global supply chain problems. But imagine a world without them.

The U.S. trade deficit is hitting record highs — and it's fueled by a surge in demand for imports, mostly from East Asia. On both land and at sea, the shipping industry is struggling to keep up.