Explore Bridgeport, the most political neighborhood in the most political of cities--home to five Chicago mayors and parades of politicians honoring its power at national conventions. Once a Native American village traversed by Jacques Marquette and Louis Jolliet, as Chicago grew the area was called Hardscrabble, then Cabbage Gardens, and finally Bridgeport. Immigrants built it: the Irish dredged a canal and mined a quarry that led to slaughterhouses, cooperages, rolling mills, and breweries that were worked by Germans, Bohemians, Swedes, and Poles. Held dear as the "Heart of Lithuania,"...