If you dig under it and damage my house, you will have aggressed against me. If I have a foundation or a sidewalk or a garden, I am not sure how you will get under it. If you damage my garden, or sidewalk, etc, that is aggression by the logic I have already delineated above, based on the reality of individual self-ownership.
If you cannot then get under my house, for all practical intents and purposes, yes, that land is mine.
I never said I would damage your house.
But why are you insisting that I cannot use the land just because you are forcefully blocking me (e.g. by building something on it) from using it? That is circle logic and not better then government forcing you with a fence and a mine field to not set your feet on an air base for example.
So I cannot use the land and build a house on it because nobody owns it, according to your reasoning?
No, wherever I have said that? I said you have no right to force your model of ownership onto me.
(For example who gave you the right to build a house on land you don't own?)
Your society model is based on 2 fundamental rules:
A) Everything you do is voluntarily
B) If you don't agree to my model of (land) ownership I will force you to accept it.
That is a contradiction. Solve it or I can't take anarcho-capitalism serious.
I do not have a nature conferred capacity to shelter myself? You wish to force your will on me and stop me...why? You realize we all take up space and require resources to survive. Unowned land must then be able to be utilized exclusively, for survival to be a possibility. If usage cannot be exclusive, we are back at square one and I can take your dinner and use your home how I want, with or without permission.
No one is forcing any system on you any more than nature is "forcing" you to eat to live.
Where did I say I want to force you to stop building something? I just want to know what gives you the right to own land.
Why? What gives you the right to stop others from using your land?
The necessity of providing myself shelter. You don't agree that if I begin building a small home on a patch of land, and you come later, I have claim to the home?
I don't have legitimate claim to the exclusive use of that home? Why not?
And if I do have claim to the home (as you have agreed--we cannot forcefully enter each others' homes uninvited) then how will you get to the land upon which it sits? To get to it you would have to breach my home (due to the nature of physical objects in space) and yes, then I would force you out.
You seem to be unable to make a distinction between land and something you put on it.