At least one native industry survived, in fact flourished, during these years of decline and transformation. Cranberries had been commercially raised on the Cape’s bogs since the early 1800s, but the coming of the railroad opened off-Cape markets for the crop. The cranberry, as much as the cod, became the symbol of Cape Cod. In recent years, because of the success of modern marketing, many small bogs that were abandoned over the last half century have been put back into cultivation. One of these old bogs, established by James Howe in the 1880s on North Pamet Road in Truro, has been partially restored by the National Park Service. The third and unquestionably the most sweeping transformation of the Cape’s culture and landscape has occurred since World War II. With the building of the Mid-Cape Highway and the expansion of the post-war economy, the first waves of modern “washashores,” or permanent immigrants, began to arrive over the Bourne and Sagamore bridges. From 1940 to 1990 the Cape’s year-round population increased from about 30,000 to more than 175,000, with a summertime population that swells to 500,000 or more. Each year from 1970 to 1990 an average of 5,000 acres (roughly the size of Provincetown) was developed for residential and commercial uses. [Illustration: (Commercial Street in Provincetown.)] Though the Cape has been technically an island since 1914, it continues to be increasingly a part of the mainland. The old, indigenous, rural maritime culture of the Cape is irretrievably gone, though small fishing fleets continue to go out of local harbors and inlets. Cape Codders now live in a cosmopolitan contemporary culture, sharing more with their urban counterparts than with the sea captains in whose 200-year-old houses they may dwell or spend the night. With this staggering growth and its resultant pressures on the Cape’s resources and natural habitats, there has been an increasing movement to protect the Cape’s fragile landscape and its wildlife. The most dramatic and sweeping manifestation of this was the Congressional authorization of the Cape Cod National Seashore itself in 1961, but a number of homegrown environmental research, conservation, and educational organizations have also been established. These groups include the Center for Coastal Studies in Provincetown, the Wellfleet Bay Audubon Sanctuary, the Cape Cod Museum of Natural History in Brewster, the Association for the Preservation of Cape Cod, and the Compact of Cape Cod Conservation Trusts.