Which U.S. Presidents owned slaves?.
A common argument is that they were a "product of their times". Bad argument, because this guy, and people like him, were a product of their times, too.
This moment in US history brought to you by my current reading of Lies My Teacher Told Me: Everything Your American History Textbook Got Wrong, which should be required reading in all US high school history classes. Everyone needs to read this book, especially every American.