Table: gov_changes
Columns: state_class
vacator
reason_for_change
successor
date_of_successors_formal_installation

Question: Who were the successors when the date the successors were installed was February 23, 1870?
SQL: SELECT "successor" FROM gov_changes WHERE "date_of_successors_formal_installation" = 'February 23, 1870'

Question: Who was the vacator when the successor was formally installed on February 1, 1871?
SQL: SELECT "vacator" FROM gov_changes WHERE "date_of_successors_formal_installation" = 'February 1, 1871'

Question: Who was the successor that was formally installed on March 30, 1870?
SQL: SELECT "successor" FROM gov_changes WHERE "date_of_successors_formal_installation" = 'March 30, 1870'