First of all Harriet Tubman was a wonderful woman who when anybody started to change there mind she kept them up. She grew up as a slave on a plantation but she escaped.
secondly Harriet was a hero to other slaves for coming up to the cabins late at night singing a song so they would come out and she will take them to a safe place.
The reason she was such an impact on history is she tried to make a stand and stop slavery and it sort of worked. She also created the underground railroad which helped a lot of slaves after she died and that went on in history.In conclusion that is why