I don't think Motown was just invented for whites. Many young whites discovered it and got into it so Berry Gordy cottoned on to the idea of making it popular.
I remember hearing reggae records in punk clubs/gigs like Burning Spear 'do you remember the days of slavery' and didn't think they were wrong to remember the issue. ...I just wasn't responsible!
I wouldn't go so far as to say that it was invented for whites but Berry Gordy went out of his way to make it "white friendly".