Nationalism was the first leading cause for World War I. Nationalism is pride and loyalty towards one’s country. This all began with the already-existing conflict between Serbia and Austria-Hungary. Austria-Hungary had seized some of Serbia’s land that caused the conflict to happen. As Serbia was planning their attack to retrieve their lost land, a group of nationalists, called the Black Hand took the matter into their hands and assassinated the Archduke of Austria, Franz Ferdinand, when he was visiting Sarajevo, Serbia. This event caused for Austria-Hungary to declare war on Serbia on July 28th, 1914, marking the beginning of World War I.
