The correct answer is the "Confederate States had superior military leadership for the war."
Answer one is in incorrect because the North had more railroad mileage, citizens, and industry. The only real resource advantage the South had over the North was production of cotton.
Answer three is incorrect because many powerful European nations like Britain and France never formally recognized the Confederacy as an independent country (aka separate from the Union).
Answer four is incorrect because slaves did not work as spies for the Confederacy. Instead, they worked for the Union as spies, as they felt a Union victory would result in their freedom from the institution of slavery.
Therefor, the only correct answer is the second statement.
