Misc: until titanic tied with 11, this film had the most academy awards?

Questions

In 1942 1st controlled ---------- chain reaction (University of Chicago). ?

In 1958 Benelux treaty signed by Belgium, ---------- & Luxembourg. ?

In 1961 Fidel ---------- declares he's a Marxist, & will lead Cuba to Communism. ?

In 1971 Soviet Mars 3 is 1st to soft land on---------- . ?

In 1971 Abu Dhabi, Ajman, Dubai, Fujeira, Sharjah & Umm ak Qiwain form the United ---------- Emirates. ?