Kansas is actually one of the few core "American progressive rock" bands from the early 70s.
Other popular American progressive rock bands were mainly during the mid to late 70s. Styx, Journey, Foreigner (British-American) and Boston. These bands were more pop rock orientated than the earlier core progressive rock bands like Yes, Rush, and so on.
These bands, beside British bands like Jethro Tull, Supertramp and ELO, all demonstrated a prog rock influence and while ranking among the most commercially successful acts of the 1970s.
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