1.)The Civil War-What if the C.S.A. had won? Or what if the war had lasted just a little longer? 2.)Popular Culture-Everything from video games to comics and so much in between.....what if Super Mario wasn't a plumber but a superhero? Or what if Superman had landed in Canada and not Kansas? 3.)Cold War-Possibly the most important epoch of the modern era. What if the conflict had gone hot? 4.)The American Revolution/Early America in general-So much to work with here. 5.)Automobiles-I'd honestly say that of all the inventions of the past 200 years, the automobile has probably had the most impact, of all. Entire cities have been built, and re-built, around the car. It has become a status symbol, and a perennial icon in popular culture from Los Angeles to Tokyo, from New Zealand to South America.