Ask this question again, you're going to need a more specific time the president has done this. however, if you are asking about WWI, the USS Lusitania, the Zimmerman Telegram, German U Boats targeting American ships, and so on.
Answer:
well the southern states had to have income to fund the war, cotton, but the northern states had higher prices. hopes this helps
Explanation:
america declared war on japan and joined the allies
