What was the UK broadcast date for the episode which visited USA?
CREATE TABLE table_15211468_1 (
    uk_broadcast_date VARCHAR,
    countries_visited VARCHAR
)
SELECT uk_broadcast_date FROM table_15211468_1 WHERE countries_visited = "USA"
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: What was the UK broadcast date for the episode which visited USA? ### Input: CREATE TABLE table_15211468_1 (
    uk_broadcast_date VARCHAR,
    countries_visited VARCHAR
) ### Response: SELECT uk_broadcast_date FROM table_15211468_1 WHERE countries_visited = "USA"