Whose most important works were a series of ten plays depicting African-American experience in twentieth-century America?

What U.S. President successfully proposed the most wide-ranging civil rights legislation in the 20th century?

A. John Kennedy B. Lyndon Johnson C. Dwight Eisenhower D. Jimmy Carter

For whom did Marie-Louise-Élisabeth Vigée-Lebrun serve as an official portraitist?

A. King Louis VX B. King David C. Marie-Antoinette D. King Henry X