"I believe US women are more liberated than UK women" No doubt some are, some aren't. And the same would be true if the reverse claim were to be made.

Perhaps we haven't had as many centuries of suppression to battle as have our UK sisters. Strictly speaking no one has centuries of oppression - people only live one life at a time. I know what the expression means, but the figure of speech can be a trap.

Even as a figure of speech, I'd be inclined to doubt if there's any great difference of that sort. Strikes me there's been enough oppression around on both sides of the Atlantic. And refusal to accept it as well.