What are some famous phychofqacts in history?

I think you could look this up and google and read about them too so you can read on them as well

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict

B,c and d are the answers