The U.S. government has ruled that mattress imports from seven countries, including Thailand, Turkey, and Vietnam, have injured U.S. manufacturers. That comes after a previous case against the dumping of Chinese mattresses which appears to have worked, with Chinese mattress imports falling by 99.0% year over year in the first quarter. International sourcing seems to have shifted to the countries listed in the new complaint. Imports from the seven countries surged 1,393% in Q1 and exceeded the prior peak in supplies from China. As a comparison, imports from Canada and Mexico saw a 3.4%...