CREATE TABLE "table1_1802760_3" (
  "state_class" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_of_successors_formal_installation" text
);

Question: Where was the successor formally installed on December 3, 1858?
SQL: SELECT "state_class" FROM "table1_1802760_3" WHERE "date_of_successors_formal_installation"='December 3, 1858';

Question: Why did the change happen in the state where the formal installation happen on February 14, 1859?
SQL: SELECT "reason_for_change" FROM "table1_1802760_3" WHERE "date_of_successors_formal_installation"='February 14, 1859';