[sharemywin]

Depends on what you mean. Government defines property so just by how you define property you can change what "natural" means.

Controlling supply or distribution, network effects are natural ways to get to a monopoly.

[bostonscott]

You said:

"but monopolies are also created through natural means and that still doesn't change my general premise"

I'm just looking for an example of a single monopoly that fits your statement.