How did personal liberty laws increase tensions between the north and the south over the fugitive slave act?

Some northern states used personal liberty laws to nullify the Fugitive Slave Act, written to help the South.

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question - in the 1900s there were two competing views about the environment that often pitted industrialist and conservationist against one another. how were these two competing views demonstrated by the environmental policies of president roosevelt and president taft?

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a. favoring native born americans over immigrants.