"...The Court ...[recognizes]...the persistence of racial inequality and a majority's acknowledgement of Congress's authority to act affirmatively, not only to end discrimination, but also to counteract discrimination's lingering effects. Those effects, reflective of a system of racial caste [legal segregation and discrimination] only recently ended, are evident in our work places, markets, and neighborhoods. Job applicants with identical resumes, qualifications, and interview styles still experience different receptions, depending on their race."