The war started in 1914, Francis Ferdinand was assassinated on June 28th which was the reason for the war. World War 1 ended officially on November 11, 1918 and on June 28 1919 the treaty of Versailles was signed.
14th August 1914 until 11th November 1918.
Third period of World War II happened in 1945.
The cold war
The proper noun forms for the first world war is World War 1, World War I, or World War One.
The 'Cold' war .
It is called the "interwar period" as its between 2 world wars.
World War I started in 1914. "Pre-World War I" may refer to anything before World War I; it is not a precisely defined time period. In other words, this period obviously ends in 1914, but there is no precise starting date.
The 1920s were a period of relative peace between World War I, which ended in 1918, and World War II, which started in 1939.
The Phoney War
the cold war
Period of peece
I believe 1919-1925