What happens if you get into an accident but only have a license but no insurance but the other person has a license and insurance?

Two problems...

First, if the accident was in any way your fault, then you are on the hook for that percentage of the cost of the accident. Since most accidents are never 100% one person's fault, this could cost you thousands or more.

Even though the other driver most probably has un-insured/under-insured coverage, you can be assured that he/she will subrogate the claim, and their insurance company will come after you for payment.

Second, many states require insurance as a requirement for driving a car. Failure to have insurance is a chargeable offense, and you could be fined and/or jailed because of this. At minimum, you can expect that your license will be suspended or revoked.