The overarching concern in the idea of justice is the need to have just relations with others—and even to have appropriate sentiments about others; and what motivates the search is the diagnosis of injustice in ongoing arrangements. In some cases, this might demand the need to change an existing boundary of sovereignty—a concern that motivated Hume’s staunchly anti-colonial position. (He once remarked, “Oh! How I long to see America and the East Indies revolted totally & finally.”) Or it might relate to the Humean recognition that as we expand trade and other relations with foreign countries, our sentiments as well as our reasoning have to take note of the recognition that “the boundaries of justice still grow larger,” without the necessity to place all the people involved in our conception of justice within the confines of one sovereign state.
Amartya Sen, in The National Review, “The Boundaries of Justice.”