Quite a few. That's the story of Colonialism, at least in the early era.

American Natives, African kingdoms, and East Asian archipelagos fell like dominos when a colonial power promised a local faction opportunity to oppress their neighbors with foreign support. The English did it. The Romans did it. The Egyptians did it.

Nationalism, in the modern sense, is relatively novel and largely a consequence of language uniformity, mass transit, and mass media. Even then, it's relatively easy to get - say - a Russian enclave in a Ukrainian state to form a breakaway region at foreign prompting. Or an American political faction to elect a corporate puppet under the guise of "sticking it" to the last person in charge.