The state laws of every state in the USA require that you carry Car Liability Insurance on your vehicle. This coverage pays for damage that you cause to persons or property in an automobile accident when you are at fault. The laws regarding this insurance are determined by the individual states. This means that the requirement varies by state. In some states you will find that the state minimums are lower than in other states.
Liability insurance is required by law, but it also protects other assets that you own. If you were to have an accident that caused major damage to persons or property and your insurance coverage were inadequate, it is possible that the persons suffering the loss could file a lawsuit and take properties that belong to you.