Question

why the historians called 1914 as
a long twentieth century?
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Answer 1

The Cold War was a result of the Second World War and ended with the fall of the Soviet Union. The term is analogous to the long 19th century, also coined by Hobsbawm, denoting the period 1789 to1914, and to the long 18th century, or approximately 1688 to 1815.

Long nineteenth century. The long 19th centuryis a term coined for the period between the years 1789 and 1914 by Russian literary critic and author Ilya Ehrenburg and British Marxist historian and author Eric Hobsbawm