Which Supreme Court decision declared that federal restriction of slavery was unconstitutional?

Dred Scott

Explanation:

Dred Scott decision the U.S. Supreme Court's ruling on March 6, 1857, that having lived in a free state and territory did not entitle an enslaved person, Dred Scott, to his freedom

(britannica dot com)

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.

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