https://en.wikipedia.org/wiki/Cold_War

https://www.historylearningsite.co.uk/modern-world-history-1918-to-1980/the-cold-war/what-was-the-cold-war/

https://www.bbc.com/bitesize/guides/z8qnsbk/revision/3

https://www.history.com/topics/world-war-ii/lend-lease-act-1

https://www.biography.com/dictator/joseph-stalin

https://www.jfklibrary.org/learn/about-jfk/jfk-in-history/the-cold-war

https://www.globalsecurity.org/military/ops/cold-war-containment.htm

https://edsitement.neh.gov/curriculum-unit/origins-cold-war-1945-1949

http://www.coldwar.org/articles/40s/berlin_blockade.asp

https://www.cnn.com/2013/06/28/world/asia/korean-war-fast-facts/

https://en.wikipedia.org/wiki/Soviet_Union_in_the_Korean_War

https://en.wikipedia.org/wiki/Korean_War

https://www.globalsecurity.org/military/world/vietnam/hist-2nd-indochina-ussr.htm

https://www.history.com/topics/vietnam-war/vietnam-war-history

https://www.cnn.com/2013/07/01/world/vietnam-war-fast-facts/

https://www.history.com/topics/vietnam-war/vietnam-war-history#section_7

https://www.history.com/topics/vietnam-war/vietnam-war-history#section_12

http://www.alliiertenmuseum.de/en/topics/berlin-crisis.html

https://history.state.gov/milestones/1953-1960/berlin-crises

https://www.history.com/topics/cold-war/cuban-missile-crisis

https://www.investopedia.com/articles/investing/021716/why-ussr-collapsed-economically.asp

https://www.cato.org/publications/policy-analysis/reagans-1983-defense-budget-analysis-alternative

https://wais.stanford.edu/History/history_ussrandreagan.htm

https://graduate.norwich.edu/resources-mmh/articles-mmh/exploring-5-reasons-for-the-collapse-of-the%20soviet-union/

https://www.bbc.com/bitesize/guides/zq63b9q/revision/3

https://www.bbc.com/bitesize/guides/zq63b9q/revision/5

https://en.wikipedia.org/wiki/Tear_down_this_wall!

https://www.history.com/topics/cold-war/berlin-wall

https://www.britannica.com/event/the-collapse-of-the-Soviet-Union