Car insurance is mandatory thoughout the country, including Maryland. Yet you would be amazed how many uninsured motorist claims we see every week. As many as 20% of Americans do not have any type of car insurance. The numbers in Maryland have not been estimated in years (that I have seen, anyway) but while not approaching that figure, the number is still too high.
In Maryland, the legislature made uninsured motorist coverage mandatory in 1975.