how many ranked swimmers were from the united states ?
CREATE TABLE table_204_834 (
    id number,
    "rank" number,
    "name" text,
    "nationality" text,
    "time" text
)
SELECT COUNT(*) FROM table_204_834 WHERE "nationality" = 'united states'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: how many ranked swimmers were from the united states ? ### Input: CREATE TABLE table_204_834 (
    id number,
    "rank" number,
    "name" text,
    "nationality" text,
    "time" text
) ### Response: SELECT COUNT(*) FROM table_204_834 WHERE "nationality" = 'united states'