(A) Germany
(B) Serbia
(C) ** Great Britain
(D) Mexico
EXPLANATIONS BELOW
Concept note-1: -The total value of U.S. exports grew from $2.4 billion in 1913 to $6.2 billion in 1917. Most of that went to major Allied powers like Great Britain, France, and Russia, which scrambled to secure American cotton, wheat, brass, rubber, automobiles, machinery, wheat, and thousand of other raw and finished goods.
Concept note-2: -The United States suffered a moderate economic recession from 1918 to 1919, but a mild rebound in the second half of 1919. The United States endured a more serious recession in 1920 and 1921, when the global economy collapsed.
Concept note-3: -Overview. World War I was the deadliest conflict until that point in human history, claiming tens of millions of casualties on all sides. Under President Woodrow Wilson, the United States remained neutral until 1917 and then entered the war on the side of the Allied powers (the United Kingdom, France, and Russia).