My guess would be the same as yours, that the Founding Fathers were keenly aware of the cultural foundation of property, -- they had to be, given the Indian tribes and the slavery.
Unless that civilization happens to be Marxist :-)
Don't mind my musings. It helps me to think (I think). You could just as correctly say when governments clash, right? As was the case in the Cold War. Not exactly two "civilizations", but merely two governments. As Patrick Henry (the freeper) said, property is a concept, therefore, it exists through law, which is an instrument of government, yes?
So, in summation, property is not a natural right, as is, say, self-defense. Right?