CREATE TABLE table_3011 ("District" TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date successor seated" TEXT)

What district was the successor seated in March 28, 1878?
SELECT "District" FROM table_3011 WHERE "Date successor seated" = 'March 28, 1878'
SELECT "District" FROM "table_3011" WHERE "Date successor seated" = 'March 28, 1878'