What I suggest in my work is that the modern notion of territory is produced around the same time as the modern notion of population. It is produced through many of the same kinds of techniques that Foucault identifies in relation to population: statistics and distribution of population, its distribution of population through a territory. The surveying, the mapping, the marking out of boundaries of States – this only becomes possible with developments in mathematics, particularly in coordinate geometry in the 17th century. They are the same kinds of things that Foucault thinks are central to the advent of population.
On my reading, territory and population are co-produced around the same time with the same kinds of techniques. This is why I think that some of the things that Foucault says about territory in the historical period he thinks that we’ve gone beyond, are misleading. He characterises certain thinkers as having a focus on territory. On my reading, those thinkers are not particularly focused on the question of territory, at least not in the way that we understand it today.
Then, Foucault suggests that some later thinkers do have a focus on population, but not on territory, whereas they may actually be exploring it too. So, in some ways, the question of territory actually appears later than Foucault thinks it’s displaced. The modern notion of territory, as I read it, is really a late 17th, early 18th century notion, parallel to perhaps the way that Foucault understands the question of population.