Truman reacted strongly against North Korean because he wanted to prevent the advance of communism. At this time the United States was pursuing a policy of containment of communism and the Soviet Union around the world, and the U.S.' policy in Korea followed this.
D, they were supportive of it, for that's were the name federalists' come from.
Reactionaries and the monarchy wanted war because they thought that the new government would be easily defeated by foreign powers.
One of the primary concerns of the colonists during the French and Indian War was that Great Britain would end up taxing them in order to pay for it, which turned out to be true and helped lead to the Revolution.