Our Constitution provides for its own changes -- the framers knew that, while they worked hard, the law of the land was neither perfect nor should it be entirely immutable. So they included Article V, which allows either Congress OR the states to amend the Constitution if enough people agree. We've never had a constitutional convention of the states before, but that doesn't mean we won't. There's currently a movement trying to make it happen -- we dig into the why and how of this totally legal but very difficult path to change.