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In addition to leading more than 300 enslaved people to freedom, Harriet Tubman helped ensure the final defeat of slavery in the United States by aiding the Union during the American Civil War. She served as a scout and a nurse, though she received little pay or recognition.

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This off of britannica its a trusted and official historical website like history.com

harriet Tubman (born Araminta Ross, c. March 1822 – March 10, 1913) was an American abolitionist and political activist. Born into slavery, Tubman escaped and subsequently made some 13 missions to rescue approximately 70 enslaved people, including family and friends, using the network of antislavery activists and safe houses known as the Underground Railroad. During the American Civil War, she served as an armed scout and spy for the Union Army. In her later years, Tubman was an activist in the movement for women's suffrage.

the american revolution led to the creation of a democratic republic,is the correct answer;

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