What was done to protect human rights of all people in the world after World War II?

Many United Nations peacekeeping operations and political and peacebuilding missions also include the human rights-related mandates aimed at contributing to the protection and promotion of human rights through both immediate and long-term action; empowering the population to assert and claim their human rights.

The idea of human rights emerged stronger after World War II. ... The calls came from across the globe for human rights standards to protect citizens from abuses by their governments, standards against which nations could be held accountable for the treatment of those living within their borders.

after the roman empire, the catholic church began to unify by taking on many duties of a government.