Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_30 (continent VARCHAR, country VARCHAR)
### Question:
What is the Continent that also has the United States listed as a country?
### Answer:
SELECT continent FROM table_name_30 WHERE country = "united states"