CREATE TABLE "table1_2147588_3" (
  "state_class" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_of_successors_formal_installation" text
);

Question: What change caused a change of staff in March 9, 1865?
SQL: SELECT "reason_for_change" FROM "table1_2147588_3" WHERE "date_of_successors_formal_installation"='March 9, 1865';

Question: Who was the successor for the new seat?
SQL: SELECT "successor" FROM "table1_2147588_3" WHERE "vacator"='New seat';

Question: What was the reason for change in staff in formal installations on March 15, 1865?
SQL: SELECT "reason_for_change" FROM "table1_2147588_3" WHERE "date_of_successors_formal_installation"='March 15, 1865';

Question: Who was the successor for the new seat?
SQL: SELECT "successor" FROM "table1_2147588_3" WHERE "vacator"='New seat';