At one point in the original Star Wars, Han Solo was going to be black. I was in the casting and one of the finalists was a black actor, and I just decided that I liked Harrison the best. It didn’t have to do with race at all… But I had been interested right from the very beginning to get ethnic diversity into the project.
For all the racists who are complaining about the inclusion of Finn in Episode 7, this is an extract from Star Wars: The Annotated Screenplays, which includes lots of notes, quotes, and background about the creation of the first three Star Wars films. There’s about half a page of George Lucas talking about the diversity (or lack thereof) in the trilogy.