Every state in the US has a minimum amount of car insurance. However, this is not to mean that the limits will be enough. Knowing how much is enough takes a professional that will assess your risk factors.
Auto insurance is one of the most widely available types of insurance, not only in the USA but all over the world. This means that you will have more options than you can exhaust. While that is a good thing, there is the possibility that you might end up with a car insurance policy that does not meet your needs.