Context: The state of California was admitted to the United States in 1850. That same year San Diego was designated the seat of the newly established San Diego County and was incorporated as a city. Joshua H. Bean, the last alcalde of San Diego, was elected the first mayor. Two years later the city was bankrupt; the California legislature revoked the city's charter and placed it under control of a board of trustees, where it remained until 1889. A city charter was re-established in 1889 and today's city charter was adopted in 1931.

Question: In what year did San Diego officially become a city?
Answer: 1850

Question: Who was San Diego's first mayor?
Answer: Joshua H. Bean

Question: What happened two years after San Diego elected it's first mayor?
Answer: the city was bankrupt

Question: Who controlled San Diego's charter for 2 years after it was revoked by California legislature?
Answer: a board of trustees

Question: When was San Diego's current charter adopted?
Answer: 1931

Question: In what year did San Francisco officially become a city?
Answer: Unanswerable

Question: Who was San Diego's last mayor?
Answer: Unanswerable

Question: What happened two years after San Diego elected it's last mayor?
Answer: Unanswerable

Question: Who controlled San Diego's charter for 4 years after it was revoked by California legislature?
Answer: Unanswerable

Question: When was San Francisco's current charter adopted?
Answer: Unanswerable