Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE singer (Citizenship VARCHAR, Birth_Year INTEGER)

### Question ###
Show the citizenship shared by singers with birth year before 1945 and after 1955.

### Accurate SQL ###

SELECT Citizenship FROM singer WHERE Birth_Year < 1945 INTERSECT SELECT Citizenship FROM singer WHERE Birth_Year > 1955