Which Country has a Margin of victory of 2 strokes?
CREATE TABLE "winners" (
  "year" real,
  "dates" text,
  "champion" text,
  "country" text,
  "score" text,
  "to_par" text,
  "margin_of_victory" text
);
SELECT "country" FROM "winners" WHERE "margin_of_victory"='2 strokes';