Can I drive legally without insurance?

NO! Almost every state requires you to have auto liability insurance. All states also have financial responsibility laws. This means that even in a state that does not require liability insurance, you need to have sufficient assets to pay claims if you cause an accident. If you don’t have enough assets, you must purchase at least the state minimum amount of insurance. But insurance exists to protect your assets. Trying to see how little you can get by with can be very shortsighted and dangerous.

If you've financed your car, your lender may require comprehensive and collision insurance as part of the loan agreement.

Below is an example of the state minimum limits for auto liability insurance. The first number refers to liability limits for bodily injury for any one person, the second to limits for all persons injured, and the third refers to property damage liability limits. For example, 20/40/10 means coverage up to $40,000 for all persons injured in an accident, subject to a limit of $20,000 for one individual and $10,000 coverage for property damage.