When did congress finally abolish the slave trade in the United States

January 1, 1808

Explanation:

Due to my research, "In 1807, the U.S. Congress passed a statute prohibiting the importation of slaves as of the first constitutionally-allowable moment of January 1, 1808. This act was signed by President Jefferson and entered into force in 1808, rendering this part of the Constitution irrelevant except as a historical curiosity. "

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Answer

January 1, 1808

Explanation:

Congress voted for the ban of slave importation in 1807, which made it illegal for the trade or importation of slaves from a foreign kingdom or country. The ban took effect on January 1, 1808

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the steam engine.

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the rifle.

ironclad ships.

electricity/light bulb.