What Year was the United States the country for aug 3–5?
CREATE TABLE "winners" (
  "year" text,
  "dates" text,
  "champion" text,
  "country" text,
  "score" text,
  "tournament_location" text,
  "purse" real,
  "winner_s_share" real
);
SELECT "year" FROM "winners" WHERE "country"='united states' AND "dates"='aug 3–5';