What is he first black person in the world to earn a PhD in mathematics graduated from cornell university in 1925?

The first Black person in the world to earn a PhD in mathematics was Elbert Frank Cox. He graduated from Cornell University in 1925, making significant contributions to the field of mathematics and serving as a professor at several institutions throughout his career. Cox's achievement paved the way for future generations of mathematicians and exemplified the pursuit of academic Excellence despite the racial barriers of his time.