Source
http://www.un.org/en/sections/history/history-united-nations/
http://www.un.org/un70/en/content/70ways
https://www.foreignaffairs.com/articles/2003-09-01/why-america-still-needs-united-nations
http://www.un.org/en/about-un/
http://www.history.com/this-day-in-history/the-united-nations-is-born
http://www.timelines.ws/countries/UN.HTML
https://history.state.gov/milestones/1937-1945/un