Race and racism are interconnected historically and in the modern world. This connection is related to changing social, political, and economic conditions that impact how we think of others and ourselves. The main focus of this book is the examination of these connections. It is argued that while both race and racism are social constructions, the justification for racism changed as the definition and attributes of races were modified to correspond with new developments in biology and genetics. This book explores the relationship between biological discoveries and changing social situations and their impact on race and racism.