The expansion of Boston in the 1800s was not confined to the Back Bay and the South End. Toward the close of the century, as the working population of the Downtown district swelled and public transportation (first horsecars, then electric trolleys) linked outlying suburbs with the city, development of the "streetcar suburbs" began. These areas answered the housing needs of the rising native-born middle class as well as the second-generation immigrant families already outgrowing the narrow streets of the North and West ends.
The landfill project that became South Boston—known as "Southie" and not to be confused with the South End—isn't a true streetcar suburb; its expansion predates the era of commuting. Some of the brick bowfront residences along East Broadway in City Point date from the 1840s and 1850s, but the neighborhood really came into its own with the influx of Irish around 1900, and Irish Americans still hold sway here. Southie is a Celtic enclave, as the raucous annual St. Patrick's Day parade attests.
Among the streetcar suburbs are Dorchester and Jamaica Plain (now part of Boston proper)—rural retreats barely more than a century ago that are now thick with tenements and Boston's distinctive three- and six-family triple-decker apartment houses. Dorchester is almost exclusively residential, tricky to navigate by car, and accessible by the T only if you know exactly where you're going. Jamaica Plain is a hip, young neighborhood with a strong lesbian and ecofriendly population; brunch and a wander through the neighborhood's quirky stores or through the Arnold Arboretum make for a relaxing weekend excursion. Both towns border Franklin Park, an Olmsted creation of more than 500 acres, noted for its zoo. Farther west, Brookline is composed of a mixture of the affluent and students.