UnScramble this Word: u s w g t i o n?

Questions

21 March 1975 ---------- ends monarchy after 3000 years ?

24 March 1975 ---------- TKOs Chuck Wepner in 15 to retain the heavyweight boxing title ?

25 March 1975 Faisal ibn Abd al-Aziz, king of ---------- 1964-75), shot by nephew ?

26 March 1975 "---------- " premieres in London ?

03 April 1975 ---------- stripped of world chess title for refusing to defend ?