French Empire is built around military-driven Culture generation and government flexibility — Commanders start pre-promoted, combat victories generate Culture directly, and you can borrow any government's Celebration effect regardless of which one you're actually running.
"Liberté, Egalité, Fraternité" lets you select the Celebration effects of any Government in the Modern Age, regardless of which Government you're actually using — a genuine flexibility no other civilization has. Separate tiers add Commander Units that start with (or immediately gain) a Promotion, and increased Combat Strength for units with adjacent friendly military units.
Details on French Empire's specific unique units were not part of the source material verified for this page — flagged for a follow-up pass against the official Civilopedia or game guide.
The Salon (Culture from constructing Buildings, feeding the Style Empire Tradition) and Jardin à la Française (Culture from defeating enemy units, feeding the Cocorico Tradition) are French Empire's unique buildings.