Both jus soli (citizenship by birth) and jus sanguinis (citizenship by blood) exist more for historical reasons than because one is better than the other. Both are simply a way to try and make citizenship a more clear-cut thing, because it’s as close to being a made-up thing as you can get, especially in cases such as parents having a different nationality to the child (which is even more confusing when both parents are of different nationalities).

Jus soli is more common in the Americas due to various factors, including an incentive towards immigration from richer countries during colonial times and the various movements towards emancipation of the enslaved peoples a few centuries later, but the fact remains that neither system is any more arbitrary than the other. Jus soli is often favored because it simplifies things like immigration and asylum seeking and reduces statelessness, which is still a significant issue that affects millions of people worldwide, mostly around war-torn areas.

As mentioned in another response, enfranchisement is also a very important issue that jus soli resolves, although a significant part of it is also due to other, unrelated citizenship laws that may not necessarily conflict with jus sanguinis.

That’s true, but sometimes I definitely need a little push from someone in situations like this.

Nah, some people just really suck at being assertive (and/or have really bad social anxiety).

Sounds like the person you’re married to is kind of a dick, honestly. Thinking less of other people for not understanding your own unclear language just shows a massive lack of introspection. As a local autism, though, I definitely disagree with the last point, as a significant difference between someone who has autism and someone who doesn’t is that language is understood differently (I would know), and that means you can both understand and be understood incorrectly very easily. This post is kind of deliberately divisive anyway, but I believe the point of saying something and being misunderstood, despite your best efforts (hopefully), still stands.

(Do note I’m not an astrophysicist, so this may be a bit wrong, but I think the main part of it is right.) Not exactly. Everything in the universe is constantly drifting away from everything else. The reason it is pretty much only visible at the scale of galactic clusters is that literally every force in the universe overpowers this expansion, unless the distances between the objects are truly absurd, in the range of millions or billions of light years.