Question

what was the time period of first world war​

Answer 1

Answer:

28 July 1914 – 11 November 1918 is the period of first world war

Answer 2

Answer:

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 28 June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke