Tanzania
Yugoslavia
CIS
They were still controlled by Britain while the rest of Ireland became independent.
Prior to WWII, it was Germany, Italy and Japan. I know other countries became allies of these three, but officially the Tri-Part Axis was the official treaty.
All present day countries were newly formed at some point in history
Finland
Czechoslovakia
yugoslvia
jerkinonburg
turkey
Lithuania, latvia, estonia, finland, yugoslavia, czechloslovakia. several more but these are the main ones.
Poland, Finland, Czeschslovakia, Yugoslavia, Lithuania, Latvia, Estonia, Hungary
Tanzania
Yugoslavia
Malaysia was formed in 1963 but became interdependent in 1957
Vatican City was formed with the signing of the Lateran Treaty in 1929 by Pope Pius XI and Benito Mussolini.