Answer:
World War I
Step-by-step explanation:
The factors responsible for World War I included politics, Imperialism, alliances, and nationalism.
The two groups of nations formed called the Triple Entente Alliance and The Triple Alliance.
Archduke Franz Ferdinand, killed by a Serbian nationalist in Sarajevo in 1914. The assassination of the couple is widely thought to be one of the events that start the war in Europe. The Austria-Hungary government blamed the Serbians and declared war on Serbia. Russians came to Serbia's defence.