CREATE TABLE table_2159571_2 (vacator VARCHAR2, reason_for_change VARCHAR2)

Who is every vacator with reason for change as resigned December 31, 1959?
SELECT vacator FROM table_2159571_2 WHERE reason_for_change = "Resigned December 31, 1959"
SELECT "vacator" FROM "table_2159571_2" WHERE "Resigned December 31, 1959" = "reason_for_change"