Arkansas is definitely not forgettable, if only because it’s just Ar+Kansas with a ludicrous pronunciation. It’d be a bit like getting Virginia but not West Virginia.

Rhode Island isn’t forgettable for me at least, partly just because “it’s got island in its name but mostly isn’t an island” is a fun bit of trivia, and also because of pop culture things like Miss Congeniality, or that Providence judge who’s popular on YouTube.

Baltimore is a city that I recognise the name of, but couldn’t have told you what state it’s in without looking it up. It’s also not in that top tier of famous cities I would have banned if asked to name cities, like NYC, Vegas, and Austin. I might have gotten to it eventually, but that’s only a maybe.

Delaware I think you’re probably right. I probably wouldn’t remember it without the prompting of both the letters and the map. Just the map alone and it’d have no chance of getting it. I’d maybe get it from just the abbreviations. But as it was, I did get it, which is better than I did for Maryland. As for Delaware facts…it has an eponymous river, right? I definitely can’t give many facts about it.