Not sure why it never dawned on me, but I sat listening to Kansas - Point of No Return, trying to compile a list of other American prog bands, and... nada. Zip. From my own collection, I guess maybe King's X, and Zebra, but it's still a pretty poor showing.
Ok, some Zappa/Mothers stuff ends up on lists of prog, but I really had it in my head that there was an actual "scene" here. Apparently not. Some notable Canadian bands though, I suppose, but really still only a few.
Am I missing it? Is there something so non-American about prog that for me to even mistakenly think there could be such a thing as American prog constitutes the height of doofiness?