The request is evidence. So far all I get are claims. However I know from experience that many claims are false so I want to know if this one is real or just another one made for a point without any real trust behind it.
I'm not claiming the US is perfect, but you are making a strong statement that is either completely false, or is true but only with pages of fine print (and it may turn out that if I read all those details I'd be fine with that as a place where we shouldn't allow equality in the first place)