Has American manufacturing found a champion in the unlikeliest of quarters? Walmart, the world’s No. 1 retailer, has announced several major initiatives, including a plan to increase domestic sourcing of the products it sells. Speaking at the National Retail Federation’s annual BIG Show on Tuesday, Bill Simon, the company’s CEO, pledged to buy an additional $50 billion in U.S.-made products over the next 10 years. Both Walmart and its Sam’s Club subsidiary will grow U.S. production on two fronts, according to Simon: by increasing what they buy here (in categories such as sporting goods, apparel, storage products, games, and paper products) and by shifting the production of items like textiles, furniture, and higher-end appliances onshore.