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Lincoln document on sale in Philadelphia for $900,000

PHILADELPHIA — A document signed by President Abraham Lincoln ordering Union blockades of Confederate ports, marking the official start of the Civil War, is for sale.

The Raab Collection in Philadelphia said Tuesday that it is selling the document, which it calls one of the most important in American history. The asking price is $900,000.

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Lincoln’s proclamation is dated April 19, 1861 — a week after the first shots of the conflict were fired at South Carolina’s Fort Sumter. After the Civil War ended in 1865, the US Supreme Court in an opinion called Lincoln’s April 19 blockade order the official beginning of the war.

‘‘This action was bold and with great risk,’’ said Nathan Raab, vice president of the Raab Collection. ‘‘Lincoln was aware that the blockading of ports was an act of war.’’

Some of the president’s Cabinet objected to the move, saying it could be seen as a de-facto recognition of the Confederate States of America as a sovereign nation because countries do not blockade their own ports. Lincoln, however, ‘‘was less interested in the legal definitions of ‘war’ than in victory, and he approved it despite the objections,’’ Raab said.

The document, which has been owned by a private collector who wants to remain anonymous, was exhibited recently at museums including the National Constitution Center in Philadelphia and the Abraham Lincoln Presidential Museum and Library in Springfield, Ill.

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