What was it that pushed American architects to build skyscrapers?
it was extreme high price of plot of land in US Cities, that force office complexes rise vertical on smaller premises.
A case that was not similar in Europe, see London or Paris got skyscrapers very late in 20 century
also play the Great Depression a role in 1930s Europe in lack of Art Deco Skyscraper in major cities
the 1930s one propose in Germany were not build do lack of money or do changes in policy do certain German Dictator from Austrian origin.
And here is biggest answer why there is no Art-deco skyscrapers after 1940
Do Nazi dictatorship, many Architects left Germany to USA and England they brought new concepts and Ideas in construction of Skyscraper
like Mies van der Rohe Minimalist style that replace Art Deco and Streamline modern in late 1940s and early 1950s
US Art-Deco was victim of it Time consider obsolete by people embracing Modernism architecture form Europe refugee...