A region with a single government and a united group of people?

A region with a single government and a united group of people is often referred to as a nation-state. In such a configuration, the population typically shares a common identity, culture, language, and history, which fosters a sense of belonging and solidarity. The central government exercises authority over the territory, maintaining order and providing public services. Examples include countries like Japan or Portugal, where both governance and cultural identity align closely.