John Wilkes Booth

the differences are mostly superficial. which is why our tribal instincts latch onto "races" as a way to organize humans. because outward appearance is the first impression we get of someone.

but in terms of genetics there aren't really distinct human races. even in terms of the superficial outward differences there aren't really distinct races but more like a variety of physical characteristics that our pattern-seeking brains tend to try to use to categorize people.