Now the spotlight shines on the growth, glamour and grief of New York during America's giddy postwar "Gilded Age." Exploring the incomparable wealth of the robber barons and the unabashed corruption of political leaders, such as Tammany Hall boss William M. Tweed, the episode examines the era when the expansion of wealth and poverty -- and the schism between them -- built to a crescendo. The program ends as the city itself dramatically expands its boundaries, annexing Brooklyn, Queens, the Bronx and Staten Island into a single massive metropolis -- Greater New York.

As New York spilled into the new century, the extraordinary interplay of capitalism, democracy and transformation surged to a climax. During a single generation, over 10 million immigrants arrived in New York. The city itself became an even more dramatic lure with the construction of the first subways and skyscrapers. And arising from the plight of New York's most exploited citizens came landmark legislation that would eventually transform the lives of all Americans.

In this short but dazzling period, New York became the focal point of an extraordinary array of human and cultural energies, reaching its highest levels of urban excitement and glamour. In just over a decade, New York gave birth to its signature skyscrapers, the Chrysler and Empire State Buildings, and to artistic creations like F. Scott Fitzgerald's THE GREAT GATSBY, George Gershwin's "Rhapsody in Blue," and to the jazz compositions of Duke Ellington and Louis Armstrong. Along the way, Harlem emerged as the undisputed capital of the African- American experience and the new media industries of advertising, radio networks, public relations, and magazines found their homes in midtown Manhattan.

In little more than ten years, immense new forces were unleashed in New York, from the Depression itself to the New Deal, which permanently altered the city and the country. Along the way, two of the most remarkable New Yorkers of all time came to the fore: Mayor Fiorello La Guardia and master builder Robert Moses, both of whom attempted to create, in the darkest of times, a bold new city of the future. The episode examines their careers in detail, as well as the immense public works that transformed the city in the '30s. Also explored are the demise of Mayor Jimmy Walker, the coming of the New Deal, the fate of Harlem during the Depression, and the increasingly complex impact of the automobile on the city.