Chris DeRose, a historian and political strategist, will discuss his book examining how the Civil War affected Abraham Lincoln's presidency and the five former presidents who lived through that era, in a program Tuesday at the New Canaan Library.

DeRose will discuss his book, "The Presidents' War: Six American Presidents and the Civil War That Divided Them," at 7 p.m. in the library's Adrian Lamb Room.

DeRose found that there was no unilateral support or opposition for the war, as each former president had his own reasoning for supporting or opposing Lincoln's policies and his re-election bid, according to the library's publicity for the program.

The book recounts Martin Van Buren's about-face from opposing Lincoln's first presidential bid to supporting him after Fort Sumter, and John Tyler's joining the Virginia Secession Convention after the breakdown of negotiations at the Peace Convention of 1861. It also examines the roles of James Buchanan, Millard Fillmore and Franklin Pierce, who was openly hostile to Lincoln and supportive of the South, the library release states.

DeRose is an American historian, best-selling and award-winning author, professor of law and political strategist.

Contact the library at 203-594-5003 or www.newcanaanlibrary.org.