Question

the united states abolished slavery by passing the 13th amendment in
1807.
1833.
1848.
1865.

Explanation:

The 13th Amendment to the U.S. Constitution, which abolished slavery, was ratified in 1865. The other years (1807, 1833, 1848) do not correspond to this event. 1807 saw the U.S. ban on the importation of enslaved people, not the abolition of slavery itself. 1833 and 1848 relate to abolitionist movements or other countries' actions, not the U.S. 13th Amendment.

Answer:

1865