This undated photo provided by The Raab Collection shows a document signed 

This undated photo provided by The Raab Collection shows a document signed by President Abraham Lincoln ordering Union blockades of Confederate ports, marking the official start of the Civil War. The Raab Collection in Philadelphia said Tuesday, Nov. 20, 2012, it is selling the document, which it calls one of the most important in American history. The asking price is $900,000. 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. (AP Photo/The Raab Collection)
Associated Press
This undated photo provided by The Raab Collection shows a document signed by President Abraham Lincoln ordering Union blockades of Confederate ports, marking the official start of the Civil War. The Raab Collection in Philadelphia said Tuesday, Nov. 20, 2012, it is selling the document, which it calls one of the most important in American history. The asking price is $900,000. 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. (AP Photo/The Raab Collection)
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