Some may see the assassination as a result of nationalism, which would make nationalism the sole reason or start of the war. However, when analyzed further, one can see that regardless of what caused the assassination, without it, the war would have not happened. Therefore, even though nationalism played a significant part in the assassination, the assassination itself was the commencement of the war, not nationalism.
Overall, the event that lead to the First World War was the assassination of the Archduke Ferdinand and his wife, Sophie. Gavrilo Princip killed them both on June 28th, 1914.…