Ford COO Mark Fields stands with a Fusion in front of the company's factory in Flat Rock, Michigan. A new assembly line at Flat Rock will begin making Fusions this fall, one of several moves Ford is making to try to ease tight supplies of its best-selling models. Photo credit: Ford Motor Co.

Ford (NYSE: F), like General Motors (NYSE: GM) and Chrysler, had too many North American factories a decade ago -- and all three automakers shed un-needed facilities during Detroit's wrenching restructuring.

Between them, the Detroit Three closed 27 factories in North America. The good news is that the ones that remain are booming -- but already, Ford is scrambling to keep up with demand for its hottest products. How will Ford and its Detroit rivals manage as the U.S. new-car market continues to expand? In this video, Fool contributor John Rosevear looks at why the automakers needed to cut back -- and at the challenges Ford could face as its sales continue to expand.