Well the system I am talking in the broadest sense is hierarchy.

For someone or something to have the ability to oppress they must have more power over others and they must take that power away from those others ( you can't really oppress the U.S government bc it holds more power than you). Government holds more power bc it has taken that power away from me and you (think of all the regulations and restrictions put on us or laws), and they keep that power through force (i.e the police) This whole system of oppression enables even more direct violence, if the government had no power over people it couldn't systematically oppress black people or other minority groups.

And the thing is this power imbalance has and will always lead to certain groups being oppressed bc that is how it functions.

Now how do you actually build a system without violence and hierarchy well then you can learn about anarchism and it's proposed ways of living. Anark and Andrewism have good Intro videos about all of this.