Question

what is the reason behind the first world war

Answer 1

HEY DEAR YOUR ANSWER IS HERE
,______The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.

Answer 2

World War I occurred between July 1914 and November 11, 1918. By the end of the war, over 17 million people had been killed, including over 100,000 American troops. While the causes of the war are infinitely more complicated than a simple timeline of events, and are still debated and discussed to this day, the list below provides an overview of the most frequently-cited events that led to war.