Answer :
The international war that broke out across Europe in 1914-1918 was World War I.
The war was a result of complex and interconnected factors, including military alliances, imperialist competition, nationalism, and arms race. The immediate trigger was the assassination of Archduke Franz Ferdinand of Austria-Hungary by a Serbian nationalist on June 28, 1914.
Austria-Hungary declared war on Serbia, and the conflict quickly escalated as various countries mobilized their troops.
The Central Powers, consisting of Germany, Austria-Hungary, and the Ottoman Empire, were pitted against the Allied Powers, consisting of France, Russia, the United Kingdom, and eventually, the United States.
The war quickly spread throughout Europe and beyond, with fighting taking place on multiple fronts, including the Western Front in France, the Eastern Front in Russia, and the Middle East.The war was characterized by trench warfare, with soldiers dug into elaborate systems of trenches that stretched for miles.
The use of new weapons and technology, such as machine guns, poison gas, and tanks, led to unprecedented levels of destruction and loss of life. The war also saw the first large-scale use of aircraft, which were primarily used for reconnaissance and bombing missions.
The war ended on November 11, 1918, with the signing of the Armistice of Compiègne. The human and material cost of the war was staggering, with an estimated 8.5 million soldiers and 6.6 million civilians losing their lives.
The war also had far-reaching political and social consequences, including the collapse of empires, the rise of new nations, and the redrawing of international borders. The Treaty of Versailles, signed in 1919, imposed harsh penalties on Germany, setting the stage for the rise of Adolf Hitler and the outbreak of World War II just two decades later.
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