Answer:
The Slavery Abolition Act 1833
Explanation
Jefferson had a controversial stand on slavery. Despite being a pro-union man, he's known to own more than 500 slaves. Making the public questioned what's his true stance on slavery. But on the public platform, he stated that He promise that all men (both right and black) a set of unalienable rights that consist the right of life, liberty, and the pursuit of happiness.
The Slavery Abolition Act 1833 banned slavery in all of British Territory. This act disturbed Jefferson's business considering the large part of his labor force used slaves.
Step-by-step explanation: