Swann v. Charlotte-Mecklenburg Board of Education, 000 U.S. 0, 00 S.Ct. 0000, 00 L.Ed.0d 000 (0000), and Pasadena City Board of Education v. Spangler, 000 U.S. 000, 00 S.Ct. 0000, 00 L.Ed.0d 000 (0000)]