What was he guiding principle of roosevelt's square deal?

d. Roosevelt would treat Americans with fairness and respect

Explanation:

Answer is mass marketing.

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