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 singer (Citizenship VARCHAR, Net_Worth_Millions INTEGER)
### Question:
Show different citizenships and the maximum net worth of singers of each citizenship.
### Answer:
SELECT Citizenship, MAX(Net_Worth_Millions) FROM singer GROUP BY Citizenship