The early examples in the 30s and early 40s are more dominated by black dancers, and the dancing is generally more powerful. The examples from the 1950s - taken from mainstream films about white teenagers - are mostly fairly tame. On the whole the black women are allowed to move more, pick up the men and swing them as well as vice-versa, express their physical movements more confidently. I know it is because of racism that it was acceptable to show a black woman swinging a man around, or jumping in the air and showing her knickers, and not a white woman of the same era. But the dancing of the women is not at all demeaning, regardless of race. They are full of energy and bravado.
Anyway, here are a couple of good ones.
This is the classic from Helzapoppin (1941): by a professional dance troupe. I notice that the black women dancers are all shown as working people, and they are confident and assertive with the men.
A 1945 film called Swing Fever: in this clip a woman dances with two men, a soldier and a sailor, and gets them to dance together.