The Emancipation Proclamation expanded the scope of Union war aims but was controversial in the North, where opinions remained mixed on the question of abolition. Nevertheless, white Unionists generally accepted the proclamation as a necessary war measure, and it was a great boost to the morale of African Americans and their allies. This broadside edition, one of only forty-eight copies printed, was signed by President Abraham Lincoln, Secretary of State William H. Seward, and presidential secretary John G. Nicolay. The edition was specifically created to raise funds for the Sanitary Commission at the Great Central Sanitary Fair held in Philadelphia in June 1864. Signed copies could be purchased for ten dollars. The event attracted more than one hundred thousand visitors and raised more than one million dollars, but not all of the signed copies were sold.