Question: Why is Harriet Tubman an important part of African-American history? 

Answer: Harriet Tubman was an escape slave, herself.  She returned to the South many times and led over 300 slaves to freedom on the Underground Railroad.  She never lost a passenger.  If you set out for freedom with Harriet Tubman, freedom is what you received.  She was incredibly courageous considering the price that was on her head.
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