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The countries that started World War I were Serbia, Austria-Hungary, Germany, and Russia. Those were the base and then more countries joined.
Among the countries listed, the one that was not created following World War I is likely the United States. The U.S. was established long before the war, gaining independence in 1776. Other countries that emerged after World War I, such as Czechoslovakia and Yugoslavia, were formed as a result of the geopolitical changes following the conflict.
Axis, Allies and Philippine rebels. Russia joined the Allies when Hitler invaded.
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AUSTRIAHUNGARY
In 1949, no new countries joined the United Nations; however, the UN General Assembly did admit several nations in the years following its founding in 1945. Notably, the countries that joined in 1949 were not part of the UN until they were admitted later on. The most significant membership changes occurred in the years immediately following World War II, with many nations gaining independence and seeking UN membership thereafter.
The countries that started World War I were Serbia, Austria-Hungary, Germany, and Russia. Those were the base and then more countries joined.
Unrestricted submarine warfare by the Germans provoked American involvement, following American involvement other countries joined the melee.
There were over 100 countries involved in WW1 There were 57countries involved in WW2
Madagascar
The United States joined the Allies in December 1941 .. HELP TO FIND THE OTHER COUNTRY
The League of Nations was established in 1920, following the end of World War I, and its founding members included 42 countries. One of the notable countries that joined the League of Nations in 1919, prior to its official formation, was France, which played a significant role in its creation. Other countries, such as the United Kingdom and Italy, were also part of the original member states that contributed to the League's goals of promoting peace and cooperation.
Japan
They joined other countries to defeat Hitler and the Nazis and the Japanese AND the Italians.
Countries economies became more interconnected following World War I APEX
The first countries to form the Allied forces during World War II were the United Kingdom and France, who declared war on Germany following its invasion of Poland in September 1939. Shortly thereafter, countries like Australia, Canada, New Zealand, and India joined the Allies as part of the British Commonwealth. The Soviet Union and the United States later joined the Allies after being attacked by Germany and Japan, respectively, expanding the coalition significantly.