The Solar Federation is very good at making friends with the natives they contact. In addition, their colonists are more productive than the average. They collect twice the MegaCredits per turn per tax rate percentage point from both the natives and the colonists.
This advantage is enabled by default, and can not be disabled. No special Mission or Friendly Code is required to trigger this advantage.
This advantage is worth 55 advantage points and is only available to The Solar Federation.