Which event finally led to the creation of a separate American command in Europe in March 1918? – Q/A (Question and Answer)

Answer:

The Brest-Litovsk treaty
> The Germans and the Russian Bolsheviks each signed the Brest-Litovsk treaty in March 1918. The treaty established Russia’s official withdrawal from the war, which freed up German troops from its eastern front. Germany then used those troops to launch a massive offensive at French ports at the Atlantic, which improved the German’s chances of victory. Pershing saw this moment as the right one for the United States to become involved in battle. He got permission from French army commander Ferdinand Foch to form a separate American command.