state (class)                     vacator                           reason for change                 successor date of successors formal installation
0        hawaii (1)                   new seats  hawaii achieved statehood august 21 , 1959            hiram fong (r)                       august 21 , 1959
1        hawaii (3)                   new seats  hawaii achieved statehood august 21 , 1959           oren e long (d)                       august 21 , 1959
2  north dakota (1)          william langer (r)                      died november 8 , 1959  clarence n brunsdale (r)                     november 19 , 1959
3        oregon (2)     richard l neuberger (d)                         died march 9 , 1960           hall s lusk (d)                        march 16 , 1960
4  north dakota (1)    clarence n brunsdale (r)           successor elected august 7 , 1960     quentin n burdick (d)                        august 8 , 1960
5      missouri (3)  thomas c hennings , jr (d)                    died september 13 , 1960         edward v long (d)                    september 23 , 1960

Table as JSON:
{"state (class)":{"0":"hawaii (1)","1":"hawaii (3)","2":"north dakota (1)","3":"oregon (2)","4":"north dakota (1)","5":"missouri (3)"},"vacator":{"0":"new seats","1":"new seats","2":"william langer (r)","3":"richard l neuberger (d)","4":"clarence n brunsdale (r)","5":"thomas c hennings , jr (d)"},"reason for change":{"0":"hawaii achieved statehood august 21 , 1959","1":"hawaii achieved statehood august 21 , 1959","2":"died november 8 , 1959","3":"died march 9 , 1960","4":"successor elected august 7 , 1960","5":"died september 13 , 1960"},"successor":{"0":"hiram fong (r)","1":"oren e long (d)","2":"clarence n brunsdale (r)","3":"hall s lusk (d)","4":"quentin n burdick (d)","5":"edward v long (d)"},"date of successors formal installation":{"0":"august 21 , 1959","1":"august 21 , 1959","2":"november 19 , 1959","3":"march 16 , 1960","4":"august 8 , 1960","5":"september 23 , 1960"}}