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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.
Axis, Allies and Philippine rebels. Russia joined the Allies when Hitler invaded.
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england and france
AUSTRIAHUNGARY
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
The main countries that were first in ww1 ere France, Germany, Britain, and Russia. Later on other countries, including American, joined the conflict.