The history of customizing cars began in the late 1940's after WWII. The story of this history has been documented online by The Petersen Automotive Museum in Los Angeles. You can read their fascinating article online here.
Another great resource I ran across in researching this was the customs page on Roadsters.com. It features articles on the pioneers of custom cars, favorite cars to customize, and custom car parts suppliers. You can read more on their custom car page here.
Today the movement has been a given an incredible boost by popular TV shows like Pimp My Ride and a host of imitators on other networks.
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