World war 1
http://www.theatlantic.com/magazine/archive/1999/05/was-the-great-war-necessary/377605/
http://www.johndclare.net/causes_WWI2.htm
http://study.com/academy/lesson/american-involvement-in-world-war-i-how-the-war-changed-after-americas-entry.html
http://www.dummies.com/how-to/content/american-involvement-in-world-war-i.html
https://en.wikipedia.org/wiki/Aftermath_of_World_War_I
http://www.history.com/topics/world-war-i/world-war-i-history
http://www.1914-1918.net/reviews_memoirs.htm
:http://spartacus-educational.com/FWW letters.htm
:https://theworldwar.org/explore/interactive-wwi-timeline?gclid=CPbnyInznMkCFSUSfgodUEcIGA
World War 2
http://www.historynet.com/world-war-ii
http://www.biography.com/people/joseph-stalin-9491723
http://avalon.law.yale.edu/20th_century/mp07.asp
http://www.ushmm.org/wlc/en/article.php?ModuleId=10005143
http://www.theatlantic.com/magazine/archive/1999/05/was-the-great-war-necessary/377605/
http://www.johndclare.net/causes_WWI2.htm
http://study.com/academy/lesson/american-involvement-in-world-war-i-how-the-war-changed-after-americas-entry.html
http://www.dummies.com/how-to/content/american-involvement-in-world-war-i.html
https://en.wikipedia.org/wiki/Aftermath_of_World_War_I
http://www.history.com/topics/world-war-i/world-war-i-history
http://www.1914-1918.net/reviews_memoirs.htm
:http://spartacus-educational.com/FWW letters.htm
:https://theworldwar.org/explore/interactive-wwi-timeline?gclid=CPbnyInznMkCFSUSfgodUEcIGA
World War 2
http://www.historynet.com/world-war-ii
http://www.biography.com/people/joseph-stalin-9491723
http://avalon.law.yale.edu/20th_century/mp07.asp
http://www.ushmm.org/wlc/en/article.php?ModuleId=10005143