General Motors' sales in China increased 28.8% in 2010 while U.S. sales rose just 6.3%. GM is one of the best-positioned automakers in emerging markets, even better than Toyota, says one expert.General Motors Co. sold more vehicles in China than it did in the U.S. last year, marking the first time a foreign market has outpaced the automaker's domestic sales in its 102-year history.