Table: territory_changes
Columns: district
vacator
reason_for_change
successor
date_successor_seated

Question: Name the date successor seated for successor being vacant
SQL: SELECT "date_successor_seated" FROM territory_changes WHERE "successor" = 'Vacant'

Question: Name the vacator for kentucky 2nd
SQL: SELECT "vacator" FROM territory_changes WHERE "district" = 'Kentucky 2nd'

Question: Name the successor for election was successfully contested july 30, 1861
SQL: SELECT "successor" FROM territory_changes WHERE "reason_for_change" = 'Election was successfully contested July 30, 1861'

Question: Name the successor for vacant and december 3, 1862
SQL: SELECT "successor" FROM territory_changes WHERE "reason_for_change" = 'Vacant' AND "date_successor_seated" = 'December 3, 1862'