SCOTT SIMON, HOST:
Today marks the 150th anniversary of a critical moment in U.S. history. September 22, 1862, President Abraham Lincoln issued the preliminary Emancipation Proclamation, announcing his intention to free the slaves in the states rebelling against the Union.
An exhibit honoring the anniversary opens in Harlem this weekend. And from New York, NPR's Joel Rose reports.
JOEL ROSE, BYLINE: Abraham Lincoln didn't officially free the slaves in the Confederacy until the formal Emancipation Proclamation in January of 1863. But he announced his intention to do it 100 days earlier, in what historians call the preliminary Emancipation Proclamation. This, and Lincoln's hand-written manuscript are both on display in Harlem.
JOHN KING: There's a simple way to remember it, as this moral moment of freedom. But as always with politics, there's actually a complicated history behind it.
ROSE: John King is New York State's commissioner of education. He says Lincoln was trying to strike a delicate balance. He wanted to free the slaves partly to give the Union a military advantage over the Confederacy. But Lincoln wanted to do it without actually abolishing slavery. That would have offended the border states that sided with the Union and where slavery was still legal. If you look at Lincoln's manuscript closely enough, you can see the effort he put into it.
KHALIL GIBRAN MUHAMMAD: Even his own struggle - the newspaper clippings cut out here, the scratched-out sentences and trying to figure out which precise language - shows us just how hard it is to do the work of making freedom and democracy real for people. This is one of those transformative moments.
ROSE: Khalil Gibran Muhammad directs the Schomburg Center for Research in Black Culture, where the manuscript is on display this weekend. Muhammad notes that Lincoln didn't create this transformative moment all by himself. Throughout the war, he was hearing from generals in the field about slaves who ran away by the thousands, hoping to join the Union army.
MUHAMMAD: To say, you know, we are here to demand our freedom. And we know you are here for other reasons, but you can't ignore us. We won't be ignored.
ROSE: Lincoln's handwritten manuscript didn't stay in his possession for long. It was auctioned off in 1864 - before the Civil War was even over - to raise money for relief efforts. Then the manuscript was sold to the state of New York, which helped to organize the current traveling exhibition. It opened yesterday with a special showing for high school students in Harlem. I asked senior Kamal Grant what the manuscript means for him.
KAMAL GRANT: I think it means like opportunity. Because, I mean, it's basically the reason why we're even looking at it right now. Because it gave, like, people like me a chance to even be relevant in the world.
ROSE: Lincoln's manuscript is on display in Harlem through Monday before traveling to seven other cities around the state.
Joel Rose, NPR News, New York.
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