Land ownership and the rights in property are central to the American character, having originated as part of the colonial dialogue that led to the American revolution. Yet there has also been substantial social conflict over who has claims to property, and in whose interest. This article presents an interpretive history of citizenship claims to land and property from the colonial period to the present. It argues that a theme in this history is an ever expanding realm of citizenship claims against the individual owner, most markedly since the beginning of the twentieth century. The emergence of the modern environmental movement and a counter so-called private property rights movement in the 1970s forward has accentuated this social conflict. The future likely holds increased conflict in an era of social and political polarisation. The outcome is uncertain, and will depend on democratic dialogue among those with strongly opposing perspectives.