Ironic that you should ask this on the heels of Donald Trump being elected President of the United States. That's proof that demagogues still hold sway, that bigotry can so rise from the masses. Hitler blamed World War I on the Jews because it was the Jewish mafia, then known worldwide as the Black Hand, that assassinated Archduke Franz Ferdinand on Serbia's behalf. Germany was blamed for the war, but it was the Allies that started the war. Germany only got into it in defense of Austria-Hungary, whose Sovereign and his wife, Princess Sophie, had been gunned down in the streets of Sarajevo while on a mission of peace there after the Ottoman Empire had asked Austria-Hungary to help them broker peace in the Balkans, which had been at war for years. Not that all Jews were responsible, and certainly not those millions of Jews killed during the Holocaust, but Hitler did have a point about Jews starting World War I, for the organization then known as the Black Hand has since evolved into the organization we know today as Mossad, which is Israel's intelligence agency– its CIA.