[ WP ] A person is given one year in order to prepare to go back in time to any point in history .

Nineteen Thirty Three was a year that would go down in infamy. That was the year the charismatic and wildly loved leader, Adolph Hitler, suddenly exploded during a rally when a naked man from the future materialized in his chest cavity. 
 
 The man ’ s name has been lost to history, but his incredibly precise work of carefully manipulating theoretical physics and a recently opened time rift had saved more lives than anyone could ever imagine. It was also considered, in 1933 at least, a horrible tragedy. When the time portal re-opened again an equally clever and idealistic scientist came back seconds before the first one arrived to shove Hitler out of way of the first scientist's teleport. The scientists then fought, but the one who came back to save Hitler has a lifetime to prepare, and was a ripped perfect specimen of a man. Hitler thanked the future scientist, and with his amazing knowledge of twenty-first century physics and Hitler ’ s popular appeal they went on to make that timeline the golden age of evil scientists everywhere. 
 
 By the third iteration the time loop was a well-known phenomenon, and Nazi scientists were eager to utilize it for Germany ’ s glory. The third time a whole squad was sent back to help cement victory in the war, although at the first chance they had to arm themselves they mutinied, gunning down Hitler and the other scientists and demanding control of the country, only to be ripped apart when a rag-tag group of future oppressed peoples returned to their exact location. 
 
 They managed to get even more people through the portal than even the Nazis could, and the surplus men and woman colonized the past. Knowing that the day the portal would re-open was coming, they began training for war. They knew one day they could return to the thirties and establish dominance with nothing but wave after wave of kung fu masters. They were quickly followed by another, larger military group, descended from their own triumph over the past and armed with even more refined technique. 
 
 It was humanities first war to use time travel as the main tactic. It raged on for an impossibly long time, and claimed infinite lives to senseless nazi-related naked boxing. The war did n't end until another portal was found that sent non-living mater back and forth to the year 2032 was discovered to have existed on the moon briefly in 1937. This allowed trade between the two time periods to begin, and gradually made the past a less volatile place. 

