Nationalism was another important factor that contributed to the outbreak of war in 1914. Put simply, nationalism is a sense of pride in, and a love of, one’s nation. Nationalism grows out of an understanding of common goals and beliefs between the people of a nation – for example, a shared language, culture and history. In Europe, nationalism played an important role in the lead-up to World War I. Nationalism can either unite or divide the people of a nation or region. For example, feelings of nationalism contributed to the unification of many small German kingdom states to form the German Empire (Germany) in 1871. A sense of nationalism also encouraged cooperation between Germany and Austria– Hungary, because German-language speakers ruled both empires.However, Austria–Hungary was not only made up of people who thought of themselves as Germans and spoke the German language; it was also made up of many other ethnic and language groups, such as Hungarians, Serbians and Bosnians. From around 1900 onwards, a number of ethnic groups began fighting for independence from Austria–Hungary. One region attempting to assert its independence was Bosnia–Herzegovina, an area in south-eastern Europe known as the Balkans. In the years before World War I, Bosnia– Herzegovina was under the control of Austria–Hungary. However, Bosnia–Herzegovina was made up of many different ethnic groups, including Bosnians, Serbs and Croats, who did not see themselves as historically, ethnically or culturally linked to either Austria or Hungary. Instead, most of the people of Bosnia– Herzegovina wanted to join with Serbia to form their own nation. Russia had been supporting moves by Bosnia– Herzegovina to become independent and unite with Serbia, so when a Serbian youth was accused of assassinating Archduke Franz Ferdinand of Austria in 1914, Russia was drawn into the conflict that followed.