Just update the CountryData-dataset to include (a rougher version of) Alaska for the polygon version. And using the paclet data it should get updated…right?
I am guessing that the design decision here is that (as was mentioned in those google groups postings) the for GeoPlot the entities are only considered to be closed polygons… (but what happens for the Philippines? Well,
…so much for that theory (also there’s a mismatch between the hi-lighted polygons and the underlying map data and some islands seem not to be included)
By the way, I would never have figured this out if it was not in an example in the documentation. I tried several attempts at entity discovery using control-= but didn’t come up with an equivalent except to explicitly include Alaska as an additional entity.