Which tennis team is from the United States?
CREATE TABLE "list_of_winners" (
  "year_of_award" real,
  "athlete" text,
  "nation_of_citizenship" text,
  "team" text,
  "competition_governing_body_or_league" text,
  "sport" text
);
SELECT "team" FROM "list_of_winners" WHERE "sport"='tennis' AND "nation_of_citizenship"='united states';