A number of things. 1) the assassination of Austria's Crown Prince Franz Ferdinand; 2) the war that Austria started with Serbia which led to Russia's decision to mobilize its army; 3) Germany's policy of encouraging Austria not to compromise; 4) Germany's decision to declare war on Russia and start a pre-emptive strike against France.
European countries were competing with one another for control of colonies in Africa and Asia
The First World War was a contributing factor to starting the Second World War, but for the Japanese and a part of China called Manchuria, to the west, the War started in 1931.
There were a few different reasons that started World War I. The assassination of Archduke Franz Ferdinand and his wife in Sarajevo, and the escalation of violence in Bosnia were two contributing factors.
Many things happened in 1939 but the most important was the start of World War II
Hilter wanted to take over the world... which started the war
It was involve by contributing to the cold war
Slowpoke
more health problems
more health problems
There is no World War 3.
It is important because it is the longest war in the world.
The Women were very important during World War one.