In theory all land in Canada except maybe aboriginal lands is owned via grants from the crown, i.e. from the monarch.  She owns everything in principle but gives us right to possess and use it. This is not true in the USA, since they fought a war of independence.  It would be difficult to rescind all those land grants and not mess with people's private ownership of land, although 'crown lands' could probably be redesignated as government property. I'd like to be rid of the monarchical systems too, but there are technical obstacles to doing that.