An empire is a large political unit where one authority rules over many lands and peoples, often far beyond the original homeland.
Key features include:
- Central authority: a single ruler or government that makes decisions for the whole realm.
- Territorial diversity: many different regions and peoples under one rule.
- Expansion: growth through conquest, annexation, or diplomacy.
- Administration: bureaucracies, roads, taxes, armies to manage far-flung lands.
- Legacy: languages, laws, and cultures that persist long after the empire's height.
Examples include the Roman Empire, the British Empire, the Mughal Empire, the Ottoman Empire, and the Mongol Empire.
How empires differ from modern nation-states: empires aim to rule diverse peoples across wide areas, often with coercive power, while many modern states focus on a more homogeneous citizenry and defined borders. Empires rise and fall for many reasons: military overreach, economic strain, local resistance, and changes in trade or technology.