What unites women?

I feel like this is kind of a hard thing for me to talk about, because I can honestly say I have no idea what unites women. From my perspective I believe women can be united in a way that we all face hard times. They may not all be the same hard times or the same struggles, but we all have them. Different women from around the world will face completely opposite problems, but I think in the end women will come together and always support the other. Even if women are very ethnocentrism and they only believe there way is right, I think in the end women will help one another.