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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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Answer:
They thought the the Americans were being cruel to the Native Americans
The history of Nigeria can be traced to prehistoric settlers living in the area as early as 1100 BC. Numerous ancient African civilizations settled in the region that is today Nigeria, such as the Kingdom of Nri, the Benin Empire, and the Oyo Empire.