Can I get American citizenship with a California ID card?

Not exactly. Having a California identity card does not mean obtaining American citizenship, which is a legal status and can only be obtained through specific legal procedures. In the United States, the main way to obtain American citizenship is to be born in the United States or through legal immigration channels, and meet the relevant legal conditions. Obtaining American citizenship requires legal procedures such as birth certificate, citizenship application and naturalization oath. And it needs the approval of the immigration bureau or the court.