Here's the finished in-verse map of North America around that timeline's 2014. The continent is largely American territory; its last expansion was the with the "Hudson States" following the Dominion Conflict. Indeed, the story of the American Federation's (AF) "Manifest Destiny" mirrors to a degree that of its real world counterpart, with a mixture of diplomatic dealing (mainly from the British and Russians), offers to other colonies, "pioneer spirit" and occasional conflict with either rogue tribes or the RDNA (at least in the earlier days). And like the US, there was a civil war (for similar reasons), though this took place in the 1840s-50s.
Also shown are the "Main Refugee Groups" of each country: the primary/predominant nationalities of those who fled the Terror and their descendants. These also coincide with the dominant Revivalist organizations of those nations.