What measures did groups such as the united nations establish to try to prevent genocide following world war ii? were these measures successful in responding to ethnic cleansing and genocide in the 20th and 21st centuries?

Measures taken by groups such as the United Nations to try to prevent genocide following World War II included making the crime of genocide punishable under international law. The United Nations approved its Convention on the Prevention and Punishment of the Crime of Genocide (CPPCG) in 1948 which was later on ratified by more than 130 countries. However, this did not prevent future genocides such as in Yugoslavia and Rwanda

honestly you should get that checked out because it really isn't normal