What term describes the concept that Nation-States are typically not ethnically uniform?

The concept that Nation-States are typically not ethnically uniform is best captured by the term "multicultural." This term recognizes that within a single nation-state, there can be a diversity of cultural, ethnic, and social groups. A multicultural approach highlights the coexistence and interaction of various cultural identities within a society, promoting the understanding that nation-states are often composed of multiple ethnicities and cultures, which contribute to a richer and more complex social fabric.

In contrast, terms like "homogenous" and "assimilated" imply a lack of diversity and a process where differences are minimized or absorbed into a dominant culture. "Pluralistic," while acknowledging diversity, does not fully encompass the broader spectrum of cultural identities present within nation-states compared to the more comprehensive notion of multiculturalism. Therefore, the correct choice reflects the reality of diverse ethnic landscapes within nation-states.