What is Tyranny-https://www.merriam-webster.com/dictionary/tyranny
The American Revolution-http://www.american-revolutionary-war-facts.com/Events-Leading-To-American-Revolution/Events-Leading-to-American-Revolution.shtml
Tyranny Throughout History-http://www.history.com/topics/world-war-ii/adolf-hitler
http://www.history.com/topics/joseph-stalin