WWI Essay

I will being writing an essay about WWI and how WWI started an what it caused.The cause of world war one was when Franz Ferdinand the archduke of Austria-Hungary was murder along with his wife and his son who was not born yet. The murderer was Gavrilo Princip a Serbian nationalists who is part of a group known as black hand. On July 28, 1914 Austria-Hungary declared war on Serbia.