One factor that authors would disagree about would be war and peace. Liberals are optimistic about human nature. Kant an author on the liberal side said "A natural state is one of war." Kant believed "peace is established because you demand security by potential enemies." Kant is a liberal author yet he does understand the threat of war. Blainey disagrees with theory that you can establish peace. He states "Something is missing from the theory of peace which was shaped and popularized by so many gifted men in the 19th century." Blainey talks about the war between Britain and the United States. He said "They did not realize that intellectual and commercial liberty were most assured in those two nations. " That means the American Revolution
