theres always so much left out when it comes to defining a term, techno as a defined genre most defiantly came from Detroit, but only as a redefinition of other styles. Nothing they did was overwhelming unique, check out cybotron and tell me it don't sound like Kraftwerk, then theres e2 e4, the french disco underground, house, blah blah blah. It goes on. what the detroit guys did was be exactly in the right place at the right time, ie the M25 orbital circa 1988.