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Answer: the name means “Indian land” or “land of the Indians”. This name was given to the land by white settlers for the Indians that lived there when the settlers arrived.
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The part that particularly angered Northerners was that if they did not enforce the act, they were subject to jail time or a fine. Even if Northerners opposed slavery, they could still be neutral in terms of what they do to help slaves or not. The Fugitive Slave Act forced them to go against their own beliefs with this potential jail time or fine, which really angered them.
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