A Sioux Falls meatpacking plant was forced to close when it became the epicenter of COVID-19 in South Dakota. Three weeks after executives from its Chinese owner, WH Group, visited the plant, a month after President Trump’s ban on travel from China, nearly 600 of Smithfield Foods’ 3700 employees tested positive for the virus, as have 135 additional people in close contact with employees. Smithfield Foods was started in 1936 by a family in Virginia. Today, the Chinese own Armour and the famous Smithfield hams, together with the most quintessential American brand of all -- Nathan’s Famous hot dogs, with...