With an estimated population of 1,381,069 as of July 1, 2014, San Diego is the eighth-largest city in the United States and second-largest in California. It is part of the San Diego–Tijuana conurbation, the second-largest transborder agglomeration between the US and a bordering country after Detroit–Windsor, with a population of 4,922,723 people. San Diego is the birthplace of California and is known for its mild year-round climate, natural deep-water harbor, extensive beaches, long association with the United States Navy and recent emergence as a healthcare and biotechnology development center. 

Historically home to the Kumeyaay people, San Diego was the first site visited by Europeans on what is now the West Coast of the United States. Upon landing in San Diego Bay in 1542, Juan Rodríguez Cabrillo claimed the entire area for Spain, forming the basis for the settlement of Alta California 200 years later. The Presidio and Mission San Diego de Alcalá, founded in 1769, formed the first European settlement in what is now California. In 1821, San Diego became part of the newly-independent Mexico, which reformed as the First Mexican Republic two years later. In 1850, it became part of the United States following the Mexican–American War and the admission of California to the union. QUESTIONS:

Q1:
1. In what year did San Diego become part of the United States?
2. When was San Diego incorporated in the United States?
3. When did San Diego become a part of the US?
Q2:
1. What group of people is San Diego historically home to?
2. The city of San Diego is historically home to what people?
3. In the past, San Diego has been the home to what group of people?
Q3:
1. Is San Diego the largest city in the United States?
2. Is the United States' largest city San Diego?
3. Is San Diego considered to be the largest city in America?
Q4:
1. What is the population of San Diego?
2. What is San Diego's estimated population?
3. Approximately what number of people live in San Diego?
Q5:
1. Earlier, who had claimed the entire San Diego area for Spain?
2. Who once took over the San Diego bay area for Spain?
3. 
Q6:
1. When did Juan Rodriguez Cabrillo claim San Diego for Spain?
2. In what year did Juan Rodriguez Cabrillo take over the San Diego area for Spain?
3. 
Q7:
1. What happened to San Diego in 1821?
2. In the year 1821, what happened to San Diego?
3. 
Q8:
1. What is the weather like in San Diego?
2. What kind of climate does San Diego have?
3. San Diego has what kind of weather?
Q9:
1. Does San Diego have beaches?
2. Are there beaches in San Diego?
3. Does the city of San Diego have any beaches?
Q10:
1. What US military branch is in San Diego?
2. San Diego is associated with what military branch?
3. What military branch of the US is based in San Diego?
Q11:
1. San Diego became part of the US after what war?
2. After what war was San Diego incorporated into the United States?
3. After what war did San Diego become part of the US?
Q12:
1. Is San Diego the largest city in California?
2. Is San Diego California's largest city?
3. Is San Diego considered to be California's largest city?
Q13:
1. San Diego is called the 'what' of California?
2. 
3. 
Q14:
1. What else is San Diego known for?
2. What other things is San Diego known for?
3. 
Q15:
1. What conurbation is San Diego a part of?
2. San Diego is part of what conurbation?
3. 
Q16:
1. What is the San Diego-Tijuana conurbation?
2. 
3. 
Q17:
1. Who is the first largest transborder agglomeration in the United States?
2. 
3. 
Q18:
1. After being claimed by Juan Rodriguez Cabrillo, San Diego formed the basis for what?
2. After being claimed by Juan Rodriguez Cabrillo, San Diego formed the basis for what settlement?
3. What was formed after San Diego was claimed by Juan Rodriguez Cabrillo?
Q19:
1. How many years after San Diego was claimed by Juan Rodriguez Cabrillo did the settlement of Alta California form?
2. The settlement of Alta California was formed after how many years of San Diego being claimed by Juan Rodriguez Cabrillo?
3. 
Q20:
1. The independent Mexico reformed into what?
2. What did independent Mexico reform into?
3. 
