Your property is your property. PERIOD.
It should not matter in the least how you’ve been using it or not. Your ownership of it is based on paying for it, not how you decide to use it.
And NOBODY should ever be allowed to encroach on it and steal it from you because they have been illegally using it for however many years.
Us having to defend out own property rights shows what a mockery our system of government that claims to be a nation of laws really is.
It was the legal basis for the conquest and settlement of North America, for that matter.