Capitalism combines the right to property with the right to return on investment. It's certainly political, but the idea that you should be able to keep your stuff and the proceeds from your work seem universal to me.

It seems universal to you because it is all you have ever known. If you had lived in a time before the Romans chances are you wouldn't understand money at all, let alone capitalism. If you grew up in any small community throughout most of history you wouldn't have practiced capitalism but, instead, some form of mutualism where there was a degree of shared labour and harvest (e.g. tribes hunting together, preparing food together).

Capitalism (with a capital C) is a bit more than just "property with the right to return on investment". I won't repeat it all here but Wikipedia has a detailed explanation of what it is. Be sure to click around the links at the bottom to see that there are many variants of Capitalism and Socialism that share some ideas.

In the U.S. capitalism goes beyond the right to the property in most places, and says, more or less, that ALL resources are owned and there is no commons. In effect taking away the right to homeland that people used to be born with.

Sure, we have a few public parks here and there, but I can't grow food or build a house unless I own property.

the right to property is not a universal one. If you have a right to live, and we lived in a society where we shared everything, why would you need a right to property?

Not saying that it's the way things should work, but very few ideas are universsal