Let's look at it this way.
From the UK: Bananarama, Eternal, The Spice Girls, All Saints, Atomic Kitten, Sugababes, Girls Aloud, The Saturdays, Little Mix
From the US: The Supremes, The Ronettes, The Shangri-Las, LaBelle, The Pointer Sisters, Sister Sledge, Wilson Phillips, Expose, SWV, Destiny's Child, TLC, En Vogue, Fifth Harmony
Wow. The US really doesn't do pure pop, does it?
I only included groups that had continuous success, and actual groups - not just a showboating excuse for one member who could never make it on her own (Obviously Ms. Ross did, that's why the Supremes are here!)
I included 5H because I have a soft spot for them.
DEBATE!