In addition to the visual power that emanates from the conquest of a region, various improvements will be unlocked. For example, a region can be upgraded through your alliance to upgrade all of your alliance's habitats in it. Each region possesses individual bonuses. The resources required for upgrading are deposited by all alliance members in the treasury which is managed by the treasurer (new right!).
Furthermore, many new improvements are already planned and will await you within the next months.