Just a wrong set of states. Merge the small ones. Split the big ones.
Yes, exactly. I don't know why Dakota was split into two states to begin with; ND and SD should be merged into one large state (called Dakota or something like that).
It was quite literally a power grab by Benjamin Harrison for the GOP to admit that area as a ton of states at the same time to get more Senators for the Republican Party, and it's still paying dividends 130 years later.
No joke: look at the dates of ND, SD, ID, WY, MT, and WA on this map.