

Every empire has those aspirations.
There are many ways to achieve it through the complex relationships between countries and societies (e.g. soft power, cultural influence, militar control, etc) but an empire willing to try it at any cost with any means will always succeed for longer as an empire…
If I remember correctly is the same adaptation of this eye parasite of Greenland sharks, they only grow in one of the two sensors so the parasited animal is not terribly compromised and still can thrive enough to complete the life cycle of the parasite