What is the round number when nationality was United States, and player is Jeffrey Foss?
CREATE TABLE "draft_picks" (
  "round" real,
  "pick" text,
  "player" text,
  "position" text,
  "nationality" text,
  "college" text
);
SELECT COUNT("round") FROM "draft_picks" WHERE "nationality"='united states' AND "player"='jeffrey foss';