What shows for opened for the Nascar Major Series?
CREATE TABLE "list_of_auto_racing_tracks_in_the_united" (
  "track" text,
  "city" text,
  "state" text,
  "opened" text,
  "major_series" text,
  "turns" text
);
SELECT "opened" FROM "list_of_auto_racing_tracks_in_the_united" WHERE "major_series"='nascar';