Federalism
Federalism is the mixed system of government, combining a central government with regional governments in a single political system. By combining the various states into the general central government, the power of the national government increased making it strong enough to deliver
Well it depends do you mean how they are warned now or back then ?
Now: NHC issues a hurricane warning 36 hours in advance of tropical storm-force winds to give you time to complete your preparations
Back then: not sure on what the steps were but here is information about it—hurricane warning service was set up in the early 1870s from Cuba with the work of Father Benito Vines, who served as director of the Meteorological Observatory of the Royal College of Belén. He established a network of observation sites and developed the first method to forecast tropical cyclone movement,
I believe its <span>William Harry McRaven but im not 100 percent sure</span>
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.