Answer:
France
Explanation:
Following the outbreak of war in August 1914, the German Army opened the Western Front by invading Luxembourg and Belgium, then gaining military control of important industrial regions in France. The German advance was halted with the Battle of the Marne.
These are the formal ways...
1) Get 2/3rds majority vote in both houses of Congress to propose a Constitutional amendment and a 3/4ths vote of the State Legislature to ratify the amendment.
2) Call a Constitutional convention by 2/3rds of the state legislatures with a 3/4ths vote to ratify the amendment.