CREATE TABLE "table1_2192067_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: what is the total number of reasons for change where the date the successor was seated is june 8, 1876?
SQL: SELECT COUNT("reason_for_change") FROM "table1_2192067_4" WHERE "date_successor_seated"='June 8, 1876';

Question: what is the reason for change where the date the successor was seated was july 28, 1876?
SQL: SELECT "reason_for_change" FROM "table1_2192067_4" WHERE "date_successor_seated"='July 28, 1876';

Question: what is the district where the vacator is vacant?
SQL: SELECT "district" FROM "table1_2192067_4" WHERE "vacator"='Vacant';