The best replacement for roman republic is empire.

The best alternatives to roman republic are rated as following:
★★★★★  empire
★★★★  roman empire
★★★  athenian democracy
★★★  us government
★  american republic
★  american democracy
★  us democracy
★  united states government
  us republic
  greek democracy
  imperial rome
  greek polis

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Speaking about roman republic, one probably shouldn't forget about roman empire.

Other search terms related to roman republic and their ratings are:
★★★★★ roman empire
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