Jose Rivera Jr. installs a wiper and cowl screen on a Chevrolet Sonic at the General Motors Orion Assembly plant in Orion Township, Mich. Nearly four years after GM filed for bankruptcy protection, the automaker is building the Sonic, the best-selling subcompact car in the nation. It's a vehicle no one thought could be made profitably in the U.S., by a company that few people thought would last.