Most Buick vehicles sold in the United States after 2016 could be imported from China and Europe, according to two sources familiar with parent General Motors Co's plans. Only two of Buick's future U.S. models, replacements for the mid-size LaCrosse sedan and the large Enclave crossover, are expected to be built in North America, according to the sources, who did not want to be identified because their companies work with GM.... In Detroit, Cindy Estrada, head of the UAW's GM department, said the automaker would be "tone deaf" to import vehicles from overseas "after the sacrifices by U.S. taxpayers," as...