The first war was started in 1914 and which was fought about 4 years and 3 months.
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The first world war started in 1916.
the first world war started in 14 june 1914
The First World War ended in 1918, World War 2 started in 1939, so there was 21 years between them.
1940
The first declaration of war was on July 28th, 1914, when Austria-Hungary declared war on Serbia.