The entry of the United States into WWI ... helped Russia
helped Russia

was applauded by Germany
was applauded by Germany

did not make much difference to the fighting
did not make much difference to the fighting

was a decisive factor that turned the tide for the Allies.

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make 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.