The main concern of historiography is bias.
It was one of the reasons the US joined the war. With that, the Germans and Central Power started to lose (they had no chances after the sinking and the Zimmermann telegram)
Answer:
Harriet Tubman is perhaps the most well-known of all the Underground Railroad's “conductors.” During a ten-year span, she made 19 trips into the South and escorted over 300 slaves to freedom. And, as she once proudly pointed out to Frederick Douglass, in all of her journeys she “never lost a single passenger.” Harriet Tubman, too, believed that all men and women are born free. Hence, it was worth the risk each time she made a trip to the South to gather slaves.
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