Robert Heinlein: Editor of Astounding SF to whom Heinlein made his first sale?

Questions

In 1913---------- , actor (Sea Hunt, Roots, Flying High), born.?

In 1918 Gamal Abdel Nasser, President of ---------- (1954-1971?), born.?

In 1919 2 million gallons of ---------- flood Boston, USA, drowning 21.?

In 1919 Pianist & statesman ---------- becomes 1st premier of Poland ?

In 1922 ---------- Free State forms ?