The countries sending the most troops were (in order) Russia, France, UK, Italy, and the USA. As a percentage of their population, Serbia, France, Montenegro, Italy, UK, New Zealand, and Romania sent over 10% of their population to war. Russia, France, UK, and Italy had more than a million casualties. The UK and European countries become involved not by choice. Those that chose to get involved, and in the order that they joined the war, were Canada, Australia, New Zealand, and finally the USA in 1917.
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world war 1 is the first world war. Nearly all countries were involved in the fighting. The Major countries were Germany France and Brittan
World War 1 starts in July 28 1914
The U.S
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Germany and England .
There were over 100 countries involved in WW1 There were 57countries involved in WW2