You're right. That list is a bit more complicated than it looks though. There are 5 states that allow a teenager to get a learners permit on their 14th birthday.

I was aware of Iowa and Sout Dakota, but I wasn't aware that North Dakota, Kansans, and Arkansas do this as well.

Michigan and Idaho issue learners permits at 14 years and 8 months, and 14 years and 6 months respectively. However they only allow driving during a drivers education class until that course is completed. Also Montanta issues permits at 14.5 if enrolled in a drivers ed class.

Most of these states are also very rural with very small populations, so the vast majority of American 14 year olds cannot get a learners permit.