Name The Year: Rajan Mahadevan recites 31,811 digits of pi from memory.?

Questions

In 1931 Desmond Tutu, ---------- Archbishop of South Africa (Nobel Peace Prize 1982), born. ?

In 1943 ---------- North, arms dealer, born. ?

In 1943 Oliver---------- , arms dealer, born. ?

In 1950 U.S. forces invade Korea by crossing the ---------- parallel. ?

In 1951 ---------- Cougar Mellencamp, singer, born. ?