The flexible response was created and implemented during former President John F. Kennedy's administration at the year 1961 as a measure to counteract the New Look policy of former President Dwight Eisenhower in his policy of conducting a massive military action in case of war.
Slavery was still an issue, so Congress had to pass the Missouri Compromise. There were equal amounts of slave and free states before Missouri requested statehood, so there was much debate on whether Missouri should represent a free or a slave state in Congress, meaning whichever group it represented would get more representation in Congress. So, Maine was admitted as a free state at the same time Missouri was admitted as a slave state, creating the Missouri Compromise.
War used to be a grand thing before WW1 when it was considered honorable for men to go out and fight for their country. Even today, it still inspires a sense of nationalism and pride for one's country, though less now than before.
It was vague and it didn't allow for taxation by the Federal Government, And Trade was almost Impossible
