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, Birth_Year INTEGER)
### Question:
Show the citizenship shared by singers with birth year before 1945 and after 1955.
### Answer:
SELECT Citizenship FROM singer WHERE Birth_Year < 1945 INTERSECT SELECT Citizenship FROM singer WHERE Birth_Year > 1955