CREATE TABLE table_47383 ("Name" TEXT, "Born-Died" TEXT, "Term start" TEXT, "Term end" TEXT, "Political Party" TEXT)

What is the Term Start date of the Progressive Party Prime Minister?
SELECT "Term start" FROM table_47383 WHERE "Political Party" = 'progressive party'
SELECT "Term start" FROM "table_47383" WHERE "Political Party" = 'progressive party'