Nelson Mandela. First black president of South Africa ... Julius Nyerere. President of Tanzania who advocated an African form of socialism ... Mobutu Sese Seko ... caused problems for nations because they forced different ethnic groups to come together ... F.W. de Klerk. South African president who ended apartheid.
Marbury v. Madison is essential because it established the power of judicial review for the U.S. Supreme Court and lower federal courts concerning the Constitution and eventually for parallel state courts for state constitutions.