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When searching newspapers online, keep in mind that most search options do not distinguish keywords from proper names.

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Searching for last name COOK in the Palladium of Liberty at GenealogyBank provides us with these unfortunate results with "cook" indicating a job, not the last name.

Palladium of Liberty, Morristown, Morris County, New Jersey
27 May 1813
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Palladium of Liberty, Morristown, Morris County, New Jersey
23 November 1820
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Slavery was legal in New Jersey at least through the 1840s, so do not be surprised if you find this situation among your New Jersey ancestors.