Please don't yell at me

I have a genuine question. I am not a super political person and I don't want to be yelled at or yell at each other, but I just want to be educated. I have seen alot in this sub reddit that Trump being our next president means that women's rights are taken away.

My question: how?

I understand that he is against abortion and I am all for the right to choose, but roe v wade was over turned when biden and kamala were in office.