abstract. The United States acquired its first overseas territory—Navassa Island, near Haiti—by conceptualizing it as a kind of property to be owned, rather than a piece of sovereign territory to be governed. The story of Navassa shows how competing conceptions of property and sovereignty are an important and underappreciated part of the law of the territories—a story that continued fifty years later in the Insular Cases, which described Puerto Rico as “belonging to” but not “part of” the United States. Contemporary scholars are drawn to the sovereignty framework and the public-law tools that come along with it: arguments about rights and citizenship geared to show that the territories should be …