[Daynarr]

1 - There are two conditions to become MEE. First is a score threshold, which an empire must exceed in order to become a MEE. Second is a condition that FIRST empire must surpass a score of SECOND empire by some percentage (varies for human and AI player). If BOTH conditions are true, the empire becomes a MEE. So, you can only have 1 empire become MEE. The same applies for multiplayer as well.

2 - Yes, the empire will lose its MEE status, but will still be at war with other races. That empire will have to make diplomatic negotiations in order to stop these wars (it is only possible when you lose MEE status).

jc - The AI anger has nothing to do with determining MEE status. It just makes AI hate an empire that has ALREADY become MEE. It also prevents it from making any treaty or trade with MEE empire as well.