CREATE TABLE "table1_18563954_3" (
  "state_class" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_of_successors_formal_installation" text
);

Question: Why did the change happened in Massachusetts (2)?
SQL: SELECT "reason_for_change" FROM "table1_18563954_3" WHERE "state_class"='Massachusetts (2)';

Question: How many different reasons are there for the change in Connecticut (3)?
SQL: SELECT COUNT("reason_for_change") FROM "table1_18563954_3" WHERE "state_class"='Connecticut (3)';