Which is the city where most of the 1 star reviews come from?
most refers to max(count(state_abbrev)); 1 star review refers to Stars = 1
SELECT T2.city FROM reviews AS T1 INNER JOIN district AS T2 ON T1.district_id = T2.district_id WHERE T1.Stars = 1 GROUP BY T2.city ORDER BY COUNT(T2.city) DESC LIMIT 1