CREATE TABLE table_5638 ("Round" FLOAT, "Player" TEXT, "Position" TEXT, "Nationality" TEXT, "College/Junior/Club Team  ( League ) " TEXT)

What league is from the United States and a round smaller than 12.
SELECT "College/Junior/Club Team (League)" FROM table_5638 WHERE "Nationality" = 'united states' AND "Round" < '12'
SELECT "College/Junior/Club Team (League)" FROM "table_5638" WHERE "Nationality" = 'united states' AND "Round" < '12'