The Most Important Thing about the First World War

As David Thomson states, “The most important thing about the First World War is that it was the unsought, unintended product of a long sequence of events which begin in 1871”. (Andrew, 1981) Therefore, you cannot put importance on a causing factor to the Great War as it was a sequence of chained events.
Perhaps one of the first events leading to the Great War was the war of 1870-1871, or more commonly known as the Franco-Prussian war. a war won by the German Empire, known as Prussia at the time. The effect of this war was the loss of French historic land Alsace-Lorraine. Not happy with the effects of the war, France sought to gain revenge against Germany. The most important factor for this strives for retalliation was nationalism. Nationalism played a very strong role in the cause of the First World War. (Willmott, 2007) The grand alliances of the early 20th century had their origin in the statesmanship of Otto von Bismarck (1815–98), the Prussian chancellor who reshaped Europe in 1871 by creating a unified Germany following Prussias victory against France in the Franco-Prussian War.
As a result of the war, Germany acquired the coal-rich Alsace-Lorraine region, creating, Bismarck understood lasting enmity between France and Germany. Accordingly, Bismarck moved to isolate France from potential allies by tying both Russia and Austria-Hungary to Germany. In 1873, he negotiated the Three Emperors League, binding the three powers to assist one another in time of war. In 1878, Russia withdrew, and Germany and Austria-Hungary signed the Dual Alliance in 1879. The agreement bound the signatories to aid one another if either were attacked by Russia. In 1881, Bismarck negotiated the Triple Alliance. In 1883, Austria-Hungary and Romania concluded an alliance, to which&nbsp.Germany agreed to adhere.