With little fanfare, a new car factory opened in America earlier this month. The new Honda assembly plant in Greensburg, Ind., will produce 200,000 compact Civic models annually after reaching full capacity late next year. The contrast couldn't be starker between Detroit's woes and the continuing U.S. expansion of Japanese, German and Korean car companies -- in both market share and manufacturing capacity. There are two American auto industries, one generally thriving and the other drastically shrinking.

The shrinking is accelerating...