Who were these people and what are their significance to the early years of exploration: bartholomew dias, prince henry the navigator, ferdinand magellan, vasco da gamma, and christopher columbus?

Jackson  said nullification 'means insurrection and war,' and called it a treasonous attack on america. the second aspect of the  force bill  was the passing in congress of a lower tariff in 1833. this was offered as a compromise to avoid conflict with south carolina, and to attempt to defuse the tense situation.source google