Inconsistent use of " " or "-" in state names

[eatdostacos]

In the names for states, I often see some state names use spaces and some use dashes instead. For example, "Newfoundland and Labrador" is the state for "CYCA", yet "Newfoundland-and-Labrador" is the state for "CYWK". There's a mix of similar inconsistencies. Here's a few: "AGGR": "state": "Rennell and Bellona", "LECA": "state": "Castille-and-Leon"

There is also an almost even split for North Carolina with 164 instances of "state": "North-Carolina" and 151 instances of "state": "North Carolina". To find more examples, you can search for instances of '"state": "North ' and instances of '"state": "North-' to see the different ones.

Is there a standard? Should the space be the standard instead of the dash?