Here’s the classification of each key detail:
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"Tubman volunteered as a scout and a spy to help the army free persons held in slavery."
- Main Idea 1
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“This was the first of many trips for Tubman as a ‘conductor’ on the Underground Railroad.”
- Main Idea 1
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“The last stop for travelers became Canada, where slavery was not allowed.”
- Main Idea 1
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“Tubman changed the Underground Railroad's routes to deal with this added threat.”
- Main Idea 2