歐洲協調
Nationalism played a role in the fall of both the first and second phases of the Concert of Europe, and was generally on the rise around the world before the start of the first World War; nationalism is seen by some scholars as a driving factor in the start of the first World War. Particularly with the fall of the first phase, the rise of nationalism was in almost direct opposition to the core cooperative functions of the Concert, and resulted in States who were no longer well constrained by the Congress system. The outbreak of conflict - namely in the Balkans after the assassination of Archduke Ferdinand - highlighted the final failure of the Concert of Europe, in that it was no longer able to constrain State national interests in order to maintain a cooperative international front.