https://en.wikipedia.org/wiki/Operation_Sea_Lion
https://www.quora.com/Could-Operation-Sea-Lion-have-succeeded-if-they-hadnt-concentrated-all-their-resources-to-Operation-Barbarossa
https://www.quora.com/If-Hitler-hadnt-invaded-Russia-would-Stalin-have-invaded-Germany
https://www.independent.co.uk/arts-entertainment/books/reviews/how-the-blitz-shaped-britain-s-future-a-new-country-arose-from-destruction-caused-by-the-aerial-assault-launched-75-years-ago-10495638.html
https://www.historycrunch.com/why-didnt-the-usa-join-world-war-ii-in-1939.html#/
https://encyclopedia.ushmm.org/content/en/article/invasion-of-the-soviet-union-june-1941#:~:text=German%20occupation%20policies.-,The%20Invasion,Union%20across%20a%20broad%20front.
https://winstonchurchill.org/resources/speeches/1940-the-finest-hour/we-shall-fight-on-the-beaches/
https://www.armytimes.com/veterans/military-history/2020/07/16/hitler-released-his-failed-plan-to-invade-england-80-years-ago-today/
https://en.wikipedia.org/wiki/Death_of_Adolf_Hitler
https://time.com/5573720/hitler-world-influence/
https://nationalinterest.org/feature/what-if-hitler-never-invaded-russia-during-world-war-ii-17492
https://www.pbs.org/wgbh/masterpiece/specialfeatures/world-war-ii-major-events-timeline/