Nationalism was a pivotal and extremely influential in the following event or events. A: The assassination of Archduke Francis Ferdinand of the Austro-Hungarian Empire.

B: The economic and industrial production rivalry cultivated between Great Britain and Germany during the early 20th century.

C: The unification of Italy in 1861 and Germany in 1871.

D: All of the above

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation:

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