Why was Russia’s exit in world war 1 considered a turning point?

The year 1917 brought two major changes in World War I. First, in its continuing effort to prevent all countries’ ships from transporting food and supplies to Britain, the German navy’s submarines sank several American ships. In response, President Woodrow Wilson asked for a declaration of war against Germany and the Central powers in April. The declaration brought a powerful new army into the war on the side of the Allied powers. The second change was occurring as Congress voted to approve the American president’s request: a revolution had begun to take place in Russia

Explanation:

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necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

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