Why did the change happen in the state where the formal installation happen on February 14, 1859?
CREATE TABLE "table1_1802760_3" (
  "state_class" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_of_successors_formal_installation" text
);
SELECT "reason_for_change" FROM "table1_1802760_3" WHERE "date_of_successors_formal_installation"='February 14, 1859';