Germany started by invading Poland despite protests from Britain. Britain then declared war on Germany and France were their allies so also declared war. Italy and Japan joined Hitler's cause because of the nature of their leaders and they thoguht they could win. America remained neutral until Jpan bombed Pearl Harbour and they declared war on Hitler. Russia was forced into war after Hitler invaded them.
When countries all over the world are in a war.
The European countries involved in World War I had long standing alliances and treaties, through familial and diplomatic relations. Once the Austro-Hungarian empire fired on Serbia, all the alliances were called in, causing more and more countries to enter into the war.
All of them hence the name WORLD WAR
All countries fighting in World War 2 used weapons.
War which alot of countries from all over the world are engaged in
World War I was also called 'The Great War'. It was given that name because it involved all of the world's great powers or most influential and important countries.
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 is a war that involves all/or most of the countries fighting in alliances against each other.
Gernany is one
many similarities it all depends in what countries if all there has been war in all countries
Nearly all the major nations were involved in World War 2.
Posion gas entered into he war for many countries involved in the war, wanted weapons other countries didn't have. and since it was back then, they used all means neccasary to win.