Nearly every country and territory in the world participated in World War II, with the exception of only a few nations which remained neutral.
World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.
World War I, also known as the First World War or the Great War, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.
Number of deaths in the WW2 per country by MetaBallStudios
The Second World War pitted two alliances against each other, the Axis powers and the Allied powers.
The Axis powers, also known as the Rome–Berlin–Tokyo Axis, were the nations that fought in World War II against the Allied Powers.
World War II: Which Countries Fought? by WatchMojo.com
The leading Axis powers were Nazi Germany, the Kingdom of Italy and the Empire of Japan; while the United Kingdom, the United States, the Soviet Union and China were the "Big Four" Allied powers.
The Kingdom of Italy was a state which existed from 1861, when King Victor Emmanuel II of Sardinia was proclaimed King of Italy, until 1946, when a constitutional referendum led civil discontent to abandon the monarchy and form the Italian Republic.
The United States of America, commonly referred to as the United States or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
Nazi Germany is the common English name for the period in German history from 1933 to 1945, when Germany was governed by a dictatorship under the control of Adolf Hitler and the Nazi Party.