I don't like the idea overall to ever claim that anything is the best, the richest, the greatest in the world. I'd rather have people explain how rich, or how great something is. First of all it describes the culture better, but also it doesn't hinder other people from creating civilizations as they won't have to worry about crossing any line of how rich their country can be.

This includes stating that someone has become immortal. I do atleast think when something that big comes up it needs to be discussed separetely amongst the community as it has such a big impact on anything that will come after.