 Complete the following phrase:  In the First World War, German plans to capture Paris quickly in the autumn of 1914 failed, and the war on the Western Front became a stalemate. The Allied naval blockade caused severe shortages of food. However, Imperial Germany had success on the Eastern Front; it occupied a large amount of territory to its east following the Treaty of Brest-Litovsk. The German declaration of unrestricted submarine warfare in early 1917 contributed to bringing the United States into the war. In October 1918, after the failed Spring Offensive, the German armies 