Yeah, try living in an impoverished town, where it's the housing on the right, spread out like the housing on the left. There are, like, no jobs (none that are actually sustainable long-term for living in this economy), but they just leveled a huge area of forest for more low-income housing (AKA Projects)

I live in a flat and it sucks. I'll probably move to living in a car eventually.

Looks around at all the houses

I think we have our answer already.

Here, buying an apartment makes you liable for any structural issues to the whole building, it's a huge risk and with how terrible build quality is these days I'd never buy an apartment

There are many highrise buildings in Australia with residents paying hundreds of thousands each for issues caused by dodgy builders. The builder simply closes the business during the warranty period and they are off the hook for claims

Do both import 100% of the goods?

I mean, yeah, apartments and such should be widely available. Awesome for high population areas, young folks, temporary housing situations, etc. Had a flat for years and will for at least a few more. However, as a drummer (and general loud music enthusiast) I am very ready to get out of the flat and get into a proper house with a basement, garage, patio for grilling with da boyes, etc.

A good mix of both is ideal. I sure wish we took better measures to mitigate the insane housing prices tho'. Sick of thin walls and and a single room trying to replace 4 rooms.

The US has about 10 million square kilometers

That's 10 million x 1 million square meters (10^13 )

There will soon be (source: people like sex) 10 billion people on earth (10^10 )

This would give you 10^13 / 10^10 = 10^3 square meters (10700 square feet) of land for everyone on earth to live on. EVERY SINGLE PERSON. Not families, individual fucking people.

All of them contained within the US.

10700 square feet to build a house, have a small garden etc. Okay, not a lot. But that's one country that could house everyone. An extreme example of course - you're not gonna be able to use all that land, some of it is uninhabitable (red states lol). But just imagine it for a second, everyone living in one country would still be comfortable. And look how much is left of the rest of the world.

1000 square meters isn't enough space? Make your house have 4 stories, who gives a shit, make your own wizard tower. In a relationship? That's 21400 square feet for the couple. Have a couple of kids? 42800 square feet. That's a decent enough house+yard for 4 people, especially if you add one or two floors.

The problem is not that there isn't enough space. The problem is that some motherfuckers want and get more than their share of square feet. And then they charge you money to live in their share of land without owning it.