Final answer:
Slavery legally ended in the United States with the Emancipation Proclamation in 1863, and was fully abolished nationwide with the ratification of the Thirteenth Amendment in 1865.
Step-by-step explanation:
The legal end of slavery in the United States occurred on January 1, 1863 with the signing of the Emancipation Proclamation by President Abraham Lincoln. However, it's important to note that the Emancipation Proclamation only applied to Confederate states during the Civil War. Slavery was fully abolished nationwide with the ratification of the Thirteenth Amendment to the United States Constitution on December 6, 1865.
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