Austria-Hungary
https://en.wikipedia.org/wiki/Austria-Hungary
https://en.wikipedia.org/wiki/Austro-Hungarian_Empire

Czechoslovakia
https://en.wikipedia.org/wiki/Czechoslovakia
https://en.wikipedia.org/wiki/Dissolution_of_Czechoslovakia

East & West Germany
https://en.wikipedia.org/wiki/German_reunification
https://en.wikipedia.org/wiki/History_of_Germany_(1945%E2%80%9390)
http://www.independent.co.uk/life-style/history/berlin-wall-what-you-need-to-know-about-the-barrier-that-divided-east-and-west-9847347.html
The Soviet Union
https://en.wikipedia.org/wiki/Dissolution_of_the_Soviet_Union
http://www.history.com/topics/history-of-the-soviet-union

Tibet
https://en.wikipedia.org/wiki/Tibet
http://www.bbc.co.uk/news/world-asia-pacific-16689779
West Florida
https://en.wikipedia.org/wiki/West_Florida
https://www.smithsonianmag.com/history/the-history-of-the-short-lived-independent-republic-of-florida-28056078/

Neutral Moresenet
https://en.wikipedia.org/wiki/
https://uk.reuters.com/article/uk-europe-history-moresnet/europes-neutral-anomaly-fetes-200-years-beyond-borders-idUKKCN0YC0GH

Rhodesia
https://en.wikipedia.org/wiki/Zimbabwe#Independence_era_(1980%E2%80%93present)
http://www.popularsocialscience.com/2012/10/19/the-fall-of-rhodesia/

The United Arab Republic
https://en.wikipedia.org/wiki/United_Arab_Republic
http://internationalrelations.org/united-arab-republic/

Yugoslavia
https://en.wikipedia.org/wiki/Yugoslav_Wars#Ten-Day_War_(1991)
https://en.wikipedia.org/wiki/Yugoslavia#Timeline