I think the original Life, Liberty and Property statement was changed because slaves were property, and they did not want to appear to endorse slavery. Or so I have read somewhere, sounds logical though.
They missed the boat however since we can never truly own property as long as they can tax it, or condemn it.
The owning of property, for the majority of Americans, has never been absolute. There has almost always been ways for those without scruples to take property away from those without the means to fight such theft.