Read the interview in three parts:
When asked why he wanted to combine a slave narrative with a Western, Tarantino said this:
It’s two separate stories I’ve always wanted to tell. One, I’ve always wanted to tell a Western story. Two, I’ve always wanted to re-create cinematically that world of the antebellum South, of America under slavery, and just what a different place it was — an unfathomable place. To create an environment and again, not just have a historical story play out — they did this and they did that, and they did this and they did that — but actually make it a genre story. Make it an exciting adventure.