ALTER TABLE "newWorldCountries"
  ALTER COLUMN "isoCode" TYPE text
, ALTER COLUMN "isNewWorld" DROP DEFAULT
, ALTER COLUMN "isNewWorld" TYPE boolean USING "isNewWorld"::boolean
, ALTER COLUMN "countryNameStd" TYPE text
;

ALTER TABLE "newWorldCountries" ADD UNIQUE ("countryNameStd");
ALTER TABLE "newWorldCountries" ADD UNIQUE ("isoCode");