Who had the most nationalism at the outbreak of world war 1?

At the outbreak of World War I, nationalism was particularly intense in several countries, but Serbia exhibited one of the strongest nationalist sentiments. Serbian nationalism was fueled by the desire to unite all South Slavic people and was a key factor in the assassination of Archduke Franz Ferdinand, which triggered the war. Additionally, Germany and France also experienced strong nationalist fervor, with Germany seeking to assert its power and France aiming to recover territories lost in the Franco-Prussian War. Overall, nationalism across Europe contributed significantly to the tensions that led to the conflict.