Harriet Tubman 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. There is some dispute as to her actual year of birth. Some historians place it around 1822, while others estimate it might have been 1820. However, what is certain is that she was born in Dorchester County, Maryland.