Our family came to the US in 1964. It didn't take long for my brother and I to get into Top 40 radio, which is what they used to call AM radio stations back then.
Between 1964 and 1967, the US music charts were dominated by British bands like The Beatles, The Rolling Stones, The Dave Clark 5, The Animals and so on. It was called "The British Invasion"!
Who stood up for the US during that period? What US group battled the British for the top of the charts?
The answer was The Supremes from Detroit with 12 # 1 songs, many gold records and regular TV appearances. They were huge!
Who else but The Beatles had that many # 1 songs? Again, it was The Supremes.
P.S. You can listen to my show (Canto Talk).