Provide a brief explanation and the societal impact of the following landmark civil rights cases:

• Heart of Atlanta Motel v. United States (1964)
• Plessy v. Ferguson (1896)
• Brown v. Board of Education (1954)
• Regents of the University of California v. Bakke (1978)
• Reed v Reed (1971)
• Dred Scott v. Sandford (1857)
• Engel v. Vitale (1962)
• Frontiero v. Richardson (1973)
• Obergefell v. Hodges (2015)
• Masterpiece Cakeshop v. Colorado Civil Rights Commission (2018)
• Korematsu v. United States (1944)