The Roaring twenties immediately followed World War I. The Great Depression followed that, followed by the second phase of World War I (usually called World War II).
The war to end all wars
Until the early 1940s World War 1 was usually referred to as the Great War.
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World War 1
Countries devoted all available resources to the war effort, eg, switching from peacetime to war production.
The Tens
World War I (known at the time as the Great War) started in 1914 and ended in 1918.
Balkans, Morocco
Airplanes had been around for just a decade when WWI started.
The war to end all wars
Until the early 1940s World War 1 was usually referred to as the Great War.
the number of its members increased
the number of its members increased
political equality
the number of its members increased
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The following art movements were not prominent prior to World War 1: Surrealism Cubism Impressionism Abstract Post-impressionism