Losing the small-car market to foreign manufacturers was easy. In the past half-century, Detroit never built great small cars or great 4-cylinder motors, never thought of little cars as a profit center and just did not like them. It is understandable how the Europeans first, then the Japanese and now the Koreans grabbed this business. What is more puzzling is how those foreigners took the top and the middle of the American car market. I am talking about near luxury, the luxury and the ultra-luxury segments--the cars with the big profits. Ever since the demise of marques like Cord and...