A sister republic (French: république sœur) was a republic established by French armies or by local revolutionaries and assisted by the First French Republic during the French Revolutionary Wars. These republics, though nominally independent, relied heavily on France for protection, and aid when push came to shove, which made the republics more of autonomous states, rather than an independent republic, which was shown after the declaration of the First French Empire, when several states were annexed, and the remaining turned into puppet monarchies.
The French Revolution was a period of social and political upheaval in France from 1789 until 1799. The Republicans who overthrew the monarchy were driven by ideas of popular sovereignty, rule of law and representative democracy. The Republicans borrowed ideas and values from Whiggism and Enlightenment philosophers. The French Republic supported the spread of republican principles in Europe, but most of these sister republics became a means of controlling occupied lands as client regimes through a mix of French and local power.