 Complete the following phrase:  Racism is a relatively modern concept, arising in the European age of imperialism, the subsequent growth of capitalism, and especially the Atlantic slave trade, of which it was a major driving force. It was also a major force behind racial segregation especially in the United States in the nineteenth and early twentieth centuries and South Africa under apartheid; 19th and 20th century racism in Western culture is particularly well documented and constitutes a reference point in studies and discourses about racism. Racism has played a role in genocides such as the Holocaust, the Armenian genocide, and the 