Can you call the U.S. a democracy when by law it only allows the effective participation of two parties that represent different wings of the white minority capitalist ruling class? Who represents the interests of the majority who are the workers & nationally oppressed?

Indeed, you cannot call the U.S. a practicing democracy. It is an inverted totalitarian state. It's constitution, which was long overdue for an overhaul, has been either gutted or disregarded. We're back to the conditions that spawned the Dec of Indep. Alter and abolish.