For the second time in five days – and also the second time in Walmart’s five decades – workers at multiple U.S. Walmart stores are on strike. This morning, workers walked off the job at stores in Dallas, Texas; Miami, Florida; Seattle, Washington; Laurel, Maryland; and Northern, Central, and Southern California. No end date has been announced; some plan to remain on strike at least through tomorrow, when they’ll join other Walmart workers for a demonstration outside the company’s annual investor meeting in Bentonville, Arkansas. Today’s is the latest in a wave of Walmart supply chain strikes without precedent in the United States: From shrimp workers in Louisiana, to warehouse workers in California and Illinois, to Walmart store employees in five states.