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Mid-century Livermore saw a demographic shift from farms and ranches to suburbanization and continuing support of the existing health care industry, New Deal programs, a naval airbase, and two national laboratories. The health care industry flourished with the dedication in 1925 of a veterans' hospital, which is still operational today; the Livermore Sanitarium for the treatment of alcoholism and mental disorders; and the Del Valle Sanitarium for the treatment of tuberculosis. During the 1930s, Livermore residents supported the Hetch Hetchy Project and numerous efforts of the Works Progress Administration. A naval airbase for training pilots was established in 1942, during World War II. This base became the Lawrence Livermore Radiation Laboratory in the 1950s and was soon accompanied by an extension of Sandia National Laboratories across the street.

Southern Colorado's unique Great Sand Dunes rise to a height of 750 feet above the San Luis Valley floor and are the nation's highest dunes not adjacent to an ocean or lake. The sweeping dunes were protected as a national monument in 1932 and as a national park in 2000. From prehistoric hunter-gatherers to the historic Ute Indian tribe, inhabitants have long used the resources of the land around the dunes. Zebulon Pike was the first American explorer to witness the dunes in 1807, followed by a long procession of other explorers, ranchers, and miners. Today, visitors from around the world come to climb up and slide down the dunes in Great Sand Dunes National Park and Preserve.