Misc: Who was the 31st president of the U S?

Questions

In 1916 Betty ---------- (in St. Louis, MO), actor ,born ?

In 1942 Mohammed---------- , boxer ,born?

In 1943 Keith---------- , guitarist (Rolling Stones),born ?

In 1945 Uruguay joined the ---------- Nations. ?

In 1947 Steven---------- , director (Jaws, Raiders of the Lost Ark, etc.),born ?