What league has an average attendance of 1452?
CREATE TABLE "year_by_year" (
  "year" real,
  "division" real,
  "league" text,
  "regular_season" text,
  "playoffs" text,
  "u_s_open_cup" text,
  "avg_attendance" real
);
SELECT "league" FROM "year_by_year" WHERE "avg_attendance"=1452;