It seems to me that the only alliances which ever expire are the ones I´m in. If I check the ledger periodically, all other alliances seem to constantly extend their expiring dates BEFORE they expire, so that they in fact never expire. I´ve set the message display so that I will receive a 'pop-up window' whenever an alliance expires. Yet for about 100 year into the game this never happened save with alliances I was in.
Hartmann
Hartmann