AUSTRIAHUNGARY
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
Japan
Countries economies became more interconnected following World War I APEX
They joined other countries to defeat Hitler and the Nazis and the Japanese AND the Italians.
US and USSR
they joined in 1939 with other countries like france, engaland and australia