CREATE TABLE table_2159537_3 (district VARCHAR2, date_successor_seated VARCHAR2)

In what district was the successor seated August 31, 1943?
SELECT district FROM table_2159537_3 WHERE date_successor_seated = "August 31, 1943"
SELECT "district" FROM "table_2159537_3" WHERE "August 31, 1943" = "date_successor_seated"