The common law and parliamentary democracy provide a foundation for the sorts of property rights and governance processes that are widely and rightly regarded as fundamental to building a prosperous modern economy. That property rights could become so well established in a society in which the “immigrants” of 1788 had no such rights is, perhaps, an ironical outcome.
And we are still coming to terms with the property rights of those descended from the inhabitants who were here before 1788. But the point is that this heritage, so important for enterprise, is something we have in common with the UK.