 Complete the following phrase:  Nazi Germanys invasion of Poland on 1 September 1939, and Britain and Frances declaration of war on Germany two days later marks the beginning of World War II. After the declaration of war, western Europe saw very little land or air active military confrontation at first, and the period was termed the Phoney War. In eastern Europe, however, the agreement between the Soviet Union and Nazi Germany signed on 23 August opened the way in September for the Soviet Unions invasion of eastern Poland, which was 