Character Explanation
Horton was like the Jews because he went from having no care in the world to being miserable, just like the Jews did in the Holocaust.
Mayzie is like the Americans because she just left her egg there with Horton and the Americans didn't help with the Holocaust until they had too.
The hunters were like the Nazi's because they took Horton away out of his will like how the Nazi's took the Jews.
The Elephant-Bird represents the end of the war because when the egg hatches it solved the issue of who the egg belonged too and who won the war.