Table: congress_changes_9
Columns: district
vacator
reason_for_change
successor
date_successor_seated

Question: Name the district for reason for change being died july 4, 1939
SQL: SELECT "district" FROM congress_changes_9 WHERE "reason_for_change" = 'Died July 4, 1939'

Question: Name the number of reason for change on may 11, 1939
SQL: SELECT COUNT("reason_for_change") FROM congress_changes_9 WHERE "date_successor_seated" = 'May 11, 1939'