Arguably, modernism. See the work of Le Corbusier, in particular, which was hugely influential in the US and led to the vision of cities as "towers in the park.

Arguably, modernism. See the work of Le Corbusier, in particular, which was hugely influential in the US and led to the vision of cities as "towers in the park." Now, that didn't turn out so great, because it turns out the real world is gritty and messy and expensive and difficult to deal with, but the art absolutely preceded the attempted implementation.