Final answer:
Andrew Jackson went against Tennessee seceding from the Union because it went against his beliefs in upholding the Constitution and protecting the unity of the country.
Step-by-step explanation:
Andrew Jackson, as the President of the United States, had a duty to uphold the Constitution and protect the unity of the country. When Tennessee seceded from the Union, it went against the principles of the Constitution, which Jackson believed in. He saw secession as an act of rebellion against the established government, and as a strong supporter of a strong centralized government, Jackson took a firm stance against secession.
Learn more about Andrew Jackson's opposition to Tennessee secession