Prosperous Unification
Concept · Stellaris 4.5.2
Prosperous Unification in the Stellaris encyclopedia: - Happiness: +15%
Prosperous Unification in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
- Happiness: +15%
- Amenities: +25%
- Resources from 
Jobs: +10%
- Will expire in 20 Years.
Since Unification Day the economy has been booming!
Source: common/game_concepts (concept_prosp_uni) and localisation/english, Stellaris Cygnus v4.5.2 (9776).