Is like the transition from monarchies to nation states.

By the 19th century, the rise of nation-states accelerated due to the spread of nationalism, the decline of feudal structures, and the unification of countries like Germany (1871) and Italy (1861). Centralized governments, uniform laws, national education systems, and a sense of collective identity became defining features. The French Revolution (1789) played a pivotal role by promoting citizenship, legal equality, and national sovereignty over dynastic rule

Maybe in 2300 they'll say something similar about nationalism