Steven Spielberg has spoken about his next film, Lincoln, which stars Daniel Day-Lewis and is set to begin filming in October.
In an interview with Empire magazine, he said: "We start shooting in October.
"Doris Kearns Goodwin's book Team of Rivals is much too big a book to be a movie, so the Lincoln story only takes place in the last few months of his Presidency and life."
He added: "I was interested in how he ended the war through all the efforts of his generals...but more importantly how he passed the 13th Amendment into constitutional law.
"The Emancipation Proclamation was a war powers act and could have been struck down by any court after the war ended.
"But what permanently ended slavery was the very close vote in the House of Representatives over the 13th Amendment - that story I'm excited to tell.”
Daniel Day-Lewis will play Lincoln in the biopic, a role that Liam Neeson was apparently previously attached to.