1. Cause: As international tensions grew, the great powers expanded their armies and navies.
Effect: WWI
2. Cause: Assassination of Archduke Francis Ferdinand
Effect: Austria declaring war on Serbia.
3. Cause: Germany invades Belgium.
Effect: Britain declares war on Germany for invading Belgium after Britain promised neutrality.
4. Cause: Austria declaring war on Serbia, Russia coming to Serbia�s aide, Germany declaring war on France, and Germany invading Belgium.
Effect: Germany, Austria-Hungary, and the Ottoman Empire being forced to pay reparations.