What is the difference between a republic and an empire in terms of power distribution?

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The crucial idea here is how authority is shared. A republic distributes power among elected representatives and established institutions, with mechanisms like assemblies, councils, and courts that create checks and balances to prevent any one person from dominating the government. An empire concentrates power in a single ruler or autocrat, backed by a centralized administration and often a standing military, so decisions flow from the top rather than from competing institutions. That contrast is what makes the described difference the best choice: power spread across elected bodies and legal structures in a republic, versus centralized authority under an emperor in an empire. The other options mix up who holds power or introduce ideas (like divine kings) that don’t capture the standard framework of these systems.