Racial history has always been the thorn in America’s side, with a swath of injustices—slavery, lynching, segregation, and many other ills—perpetrated against black people. This very history is complicated by, and also dependent on, what constitutes a white person in this country. Many of the European immigrant groups now considered white also had to struggle with their own racial identities. In A Great Conspiracy against Our Race, Peter Vellon explores how...