What is the sum of To Par, when Country is "United States", and when Year(s) Won is "1973"?
CREATE TABLE "made_the_cut" (
  "player" text,
  "country" text,
  "year_s_won" text,
  "total" real,
  "to_par" real,
  "finish" text
);
SELECT SUM("to_par") FROM "made_the_cut" WHERE "country"='united states' AND "year_s_won"='1973';