First U.S. Ambassador to the Soviet Union From 1933 until 1936, William C. Bullitt served as the first U.S. ambassador to the Soviet Union. From 1936 to 1940, he was the U.S. ambassador to France. During World War II, he served as a “roving ambassador” to U.S. President Franklin D. Roosevelt. Throughout his service to … Continue reading William C. Bullitt