Here's why:
* California is a state, not a city: California is one of the 50 states in the United States, not a city.
* No single city in the US is the largest Spanish-speaking: There are many large cities in the US with significant Spanish-speaking populations. While some cities like Los Angeles and San Antonio have large Hispanic populations, there is no single city that holds the title of "largest Spanish-speaking city".
Here's some information on Spanish speakers in the US:
* Large Hispanic populations: Many US cities have large Hispanic populations. Los Angeles, San Antonio, New York City, Miami, and Chicago all have significant numbers of Spanish speakers.
* Spanish is the second most spoken language in the US: English is the most spoken language in the US, but Spanish is the second most spoken language.
It's important to be precise with language when discussing demographics and geography.