The Middle East played a large role in World War 1. Their sultan declared a military jihad (holy war) against France, Russia and Great Britain during World War 1.
Russia's home front during World War 1 was characterized by civil war. It was these internal conflicts that led to Russia's premature withdrawal from the war.
The idea to form the league of nations came from President Woodrow Wilson
Actually the idea for forming the league of nations was originated by Sir Edward Grey while he was British Foreign Secretary.
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The Treaty of Versailles.
Answer this question…Europe's last remaining empires were dismantled.