How to Define Your Sovereignty in Space

When we talk about earth, we're broken up into regions of countries. How does this work then when you get into space who owns certain areas and how can you commercialize a space that never ends? It depends on what you ask, doesn't it? Well, as you'll know from your science background, there are two definitions of when space starts. And also a definition of how high up, how horizontal is your sovereignty. These are murky areas, which of course weren't as important as they are now.