Nationalism lead people to conflict. It was a consequence of how people used to think back then. Not only that, it contributed to the outrage that many of the ethnic groups felt for not having their own independent states. Archduke Franz Ferdinand was assassinated due nationalism by the Black Hand, a nationalist group that intended to liberate the Serbs from the Austro-Hungarian occupation. The death of Franz Ferdinand was one of the most important factos to cause the World War I.
