Source A: The Nullification Crisis (Tariff of Abominations)

For what do you throw away these inestimable (greatly valued) blessings - for what would you exchange your share in the advantages and honor of the Union? For the dream of a separate independence - a dream interrupted by bloody conflicts with your neighbors, and a vile dependence on a foreign power. If your leaders could succeed in establishing a separation, what would be your situation? Are you united at home - are you free from the apprehension of civil discord, with all its fearful consequences? But the dictates of [obligation make] me solemnly to announce that you cannot succeed. The laws of the United States must be executed. I have no discretionary power on the subject my duty is emphatically pronounced in the Constitution.

--Excerpt from Andrew Jackson’s Nullification Proclamation (1832)

Who is the author?
What is the topic?
Identify keywordsphrases that help you summarize the excerpt.
What is the main argument Jackson in making in his “Nullification Proclamation”?
How does the nullification crisis exemplify the struggle for power between state and federal governments?
How is the nullification crisis an example of sectional differences between the states?​