Why is there St. Louis and Kansas City blues?

Because when the Mississippi river overflowed causing flooding river boats carried evacuees from New Orleans to St. LouisĀ  There was a connecting river boat to Kansas City, but it wasn't free and many who would have gone on to Kansas City remained in St. Louis because they didn't have money for passage to Kansas City In 1874 activist Benjamin "Pap" Singleton called on blacks to move to Kansas because John Brown had struck the first blow against slavery there