Tip: have an atlas in your office so you can see county lines. That can be very helpful.
28 USC § 96 defines the Kansas judicial district (§§ 81-131 are the state-by-state definitions of districts), and where the courts are.
Who will decide the case is often an important tactical consideration:
When will it be decided? You can know about the timelines of various courts: do you want it to go swiftly or slowly?
What law will they apply (esp. procedural rules)?
How will we pay for the litigation?
This case is an example of procedure used as a litigation tactic.
Anyway, the court finds that Creal was domiciled in Kansas, so that makes him a citizen of Kansas, so there's no diversity (a primary domicile in Kansas, and an intent to remain there).
Start with just "thank you, your Honor." And get right into it: have a good topic sentence that lays out what you want and why. Talk to the court (don't recite).
This was a subject matter jurisdiction matter: diversity.
The trial court applies issue preclusion: we've already litigated the negligence issue, so the personal injury claim is just about damages.
And also, note that Ohio seemed to allow separate suits for injury and property damage prior to Rush. So stare decisis would make Rush's lawyer counsel her to proceed this way.
Was the first suit in municipal court because they liked the judge, or because they had to sue there because of the small amount of damages. Even so, it could have been a trap: the city might not fight hard over a $100 suit, but then blammo the result comes back to them in personal injury.
If you're the city's lawyer, you want to distinguish Vasu, so the court doesn't have to feel like it's changing the law.
So there's a claim preclusion case here (collateral attack on the judgment for contract damages). And, of course, it's also a jurisdiction argument.