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One of the first causes was Imperialism
Increased demand and competition for colonies and natural resources. They needed the resources to stay alive -
Militarlism
Countries began building larger and more powerful weapons. They also began creating much larger armies . Gets competition. -
Assassination
The Austrian-Hungarian Archduke, Franz Ferdinand was assanated by Garilo Princip -
1914
Austria-Hungarian fought against Serbia -
1914
Germany fought against Russia