For one thing the Balfour Declaration was honored. That lead directly to the formation of the State of Israel.
Trials like Neurenberg could take place charging world leaders with crimes against humanity. These courtrooms have teeth. They can sentence people. That takes care of other people.
It brought closer relations between Christian leaders and Jewish leaders. Anti Semitism tended to became unfashionable.
You might want to google the Holocaust Museum in Washington DC for more points to write about. What I've given you should get you started.
