United States, May 6 -- General Motors announced the promotion of Duncan Aldred to lead the company's North America region.Aldred, who recently has been VP, commercial growth strategies and operations, becomes GM senior VP and president of North America, effective immediately.Alred will join the GM senior leadership team, and report to Rory Harvey, GM executive VP and president, Global Markets.Harvey said Aldred has a clear mandate to build on GM's sales momentum, to continue to leverage the industry's most comprehensive vehicle portfolio, and to respond with agility to a rapidly changing external environment. In his 33-year career with GM, Aldred has held a range of leadership roles in vehicle sales, services and marketing. In 2010, he was...