Czechoslavakia (now Czech Republic and Slovakia), part of Poland came from Germany. Most of Poland, Finland, Romania came from Russia. Serbia changed to Yugoslavia. All those Middle-eastern countries (Lebanon, Iraq, Iran, turkey...) came from the Ottoman Empire. Lots of the modern day south-eastern European countries came from Austro-Hungary (like Slovenia, Bosnia and Herzergonia,...)
The US became the worlds first (and only) major superpower and many break away countries were formed like Poland, and Czechoslovakia. The league of nations was also formed to try and succeed in world peace. Germany was economically crippled
If you mean organization like a group to help countries work things out... then that would be the United Nations.
The United Nations (UN) was formed. The United States and the USSR became world superpowers. The Warsaw Pact was written and NATO was formed. The Cold War began.
The League of Nations.
The Allied Nations primarily consisted of the United States, the Soviet Union, the United Kingdom, and China during World War II. Other countries, including France, Canada, Australia, New Zealand, and numerous nations from Europe and Asia, also joined the Allies against the Axis powers. The coalition was formed in response to the aggression of Germany, Italy, and Japan. Together, these nations worked to defeat the Axis forces and restore peace.
All present day countries were newly formed at some point in history
Finland
yugoslvia
Czechoslovakia
Malaysia was formed in 1963 but became interdependent in 1957
Commonwealth of Nations, formerly known as Commonwealth and British Commonwealth, is formed from the countries of the British Empire. Commonwealth of Nations contains 54 independent modern countries. Only Mozambique and Rwanda were not part of the former British Empire.
Lithuania, latvia, estonia, finland, yugoslavia, czechloslovakia. several more but these are the main ones.
Poland, Finland, Czeschslovakia, Yugoslavia, Lithuania, Latvia, Estonia, Hungary
I think you mean "commonwealth" In the case of the British it was developed from the old empire countries as a way to enhance trade and the free passage of ideas and support among the now independent member nations
They formed treaties and pacts.In addition many formed the League of Nations and the United Nations, neither of which were very successful.
An organization of independent states formed in 1945 to promote international peace and security
Tanzania