2) If wars have been fought for thousands of years, why is the war between 1914 and 1918 commonly referred to today as the "First World War?"

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