Which key difference between lincoln’s and johnson’s reconstruction?

Lincoln’s was more lenient compared to Johnson’s which was harsher. Johnson believed that the south needed to be punished while Lincoln believed that the south should be forgiven.

Unlimited government powers

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