For the answer to the question above.
The best answer I can give is letter B.
During the civil war, there was also a competition in the global market on the supply of cotton so Europe sought other suppliers from India and Egypt and this is why the price is down after 1865
Around 7,000 troops were in the US army when the US declared war on Great Britain
The answer is:
The Louisiana Territory belonged to Spain before it was transferred to Napoleon in 1802.
Hope it helps!
In this passage, the type of warfare being described by the author is "chemical warfare".