Not really some kind of Aesthetic Smackdown, [Art Nouveau (New Art) was the last blossoming of the Victorian Style, most say from around 1880; and 1910 has been a date mentioned as the end of this. The Arts and Crafts Movement had an American version of that reaction to mass-produced manufactured items, e.g. Mission Style; but its finish has been declared as late as 1920. From flowery to simple, to design oriented to simplicity again.
Frank Lloyd Wright's style evolved from his predecessor, the other famous architect: Louis Henri Sullivan. These buildings and decor exhibit this transition from Art Nouveau to Art Deco. In Art, Impressionism developed into Cubism, and we went from Matthew Brady's daguerreotypes to Mann Ray's surrealistic photographs.
Art Deco came about officially in 1925, a derivative named from the Exposition Internationale des Arts Décoratifs et Industriels Modernes in Paris, France. But it really came to become American with the Empire State Building in 1931, but it was the last great example of 'the sky's the limit' attitude of Art Deco (certainly different from more 'down to earth' Art Nouveau), when the Stock Market Crash of 1929 precipitated the Great Depression. Then, the 'Streamline Style', came into vogue, more horizontal and austere. Miami Beach is famous for remnants of this, and I lived in a planned community from the public works of FDR, in Greenbelt, Maryland.
http://www.decopix.com/About_Art_Deco_Architecture/>