CREATE TABLE table_203_268 (id DECIMAL, "date" TEXT, "name" TEXT, "nationality" TEXT, "tonnage\ ( grt ) " DECIMAL, "fate" TEXT)

other than the united states , what other nationality were the submarines ?
SELECT DISTINCT "nationality" FROM table_203_268 WHERE "nationality" <> 'united states'
SELECT DISTINCT "nationality" FROM "table_203_268" WHERE "nationality" <> 'united states'