I want to know the answer to the following question:
What action of the Union damaged the southern cotton exports?
All the background I'm provided with is that "After the American Civil War ended in 1865, British and French traders abandoned Egyptian cotton and returned to cheap American exports,[citation needed] sending Egypt into a deficit spiral that led to the country declaring bankruptcy in 1876, a key factor behind Egypt's occupation by the British Empire in 1882.". Is that enough to answer the question?
Answer: no