Apparently, if you can't be an authority on something, no one can. America invented the skyscraper and adapted steel-and-glass architecture to just about every typological building imaginable. After WW2 America's economy enabled massive building projects, and European architects emigrated to the US en masse: Mies Van Der Rohe, Gropius, and Breuer worked along side Frank Lloyd Wright, Saarinen, SOM and Louis Kahn to define modern post-war architecture. Even architects who didn't emigrate had difficulty realizing their projects in Europe for the very reasons zeddoo stated, and their ideas were fully absorbed by architects in the US. There are more first-rate modernist buildings in the US alone than all of Europe combined.