For the second time in its 110-year history, Buick has topped one million sales in a year--and set a new overall record in the process. Last year saw the marque shift 1,032,056 vehicles, beating the company's last million-sale year in 1984, when it sold 1,003,345 cars. Whereas that 1984 volume was largely down to North America, Buick's current prosperity is largely influenced by a different country: China. Of those million-plus sales, a full 809,918 cars were sold in the Chinese market, nearly four times as many cars as the 205,509 units sold in the U.S. market. Buick is just one...