CREATE TABLE table_37254 ("Rank" FLOAT, "Stadium" TEXT, "Capacity" FLOAT, "City" TEXT, "Country" TEXT)

Which Rank has a Capacity smaller than 12,000, and a Country of united states?
SELECT SUM("Rank") FROM table_37254 WHERE "Capacity" < '12,000' AND "Country" = 'united states'
SELECT SUM("Rank") FROM "table_37254" WHERE "Capacity" < '12,000' AND "Country" = 'united states'