How did pop art originate?

How did pop art originate?
Pop Art is a movement that began in Germany in the 1950s, but had its most famous practitioners--at least in this country--in Andy Warhol and Roy Lichtenstein. Both used ads and comics for inspiration; the latter is most famous for his work mimicking comic books beginning in 1961. Of course, Bizet borrowed folk tunes in composing Carmen. Greek statues exist mainly because of Roman copies. Renaissance means "rebirth;" fifteenth century art and architecture copied from the past.