Lusitania was primarily used to ferry people and goods across the Atlantic Ocean between the United States and Great Britain. The sinking was important because
Its sinking caused moral outrage both in Britain and in the US and led, ultimately, to the USA declaring war against Germany.
President Truman fired General MacArthur for insubordination. Although Truman was committed to waging a limited war in Korea, preferring to negotiate with China and North Korea rather than expand hostilities, MacArthur openly disagreed with the president and threatened to attack China if it did not agree to terms of peace.
