What did William Seward do to end slavery?

William Seward, serving as Secretary of State under President Abraham Lincoln, played a crucial role in the political landscape that led to the end of slavery in the United States. While he did not directly abolish slavery himself, Seward was a strong advocate for the abolitionist cause and supported the Emancipation Proclamation in 1863. He also helped to navigate the passage of the Thirteenth Amendment, which formally abolished slavery in 1865. His efforts in promoting anti-slavery sentiment and guiding key legislation were significant in advancing the cause of emancipation.