NEW YORK (CBSNewYork) – As the nation marks President’s Day weekend, a presidential scholar is out with a new book on Abraham Lincoln.

Harold Holzer’s book “Lincoln: How Abraham Lincoln Ended Slavery in America,” is aimed at a younger audience and is meant to be a companion piece for the movie “Lincoln” that is up for several Academy Awards.

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Holzer discussed the book with CBS 2’s Don Dahler, who noted that the Steve Spielberg movie humanized the nation’s 16th president.

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Holzer said the book and the movie also illustrate the hardball politics Lincoln had to employ to abolish slavery.

“He took extra-Constitutional measures to preserve the Constitution that he was playing with a little bit,” Holzer said. “What he did was make sure that the three southern negotiators who were there to propose peace were delayed long enough so he could get the resolution passed in Congress.”

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