OK, so Expansion seems to begin at 75% influence, but it is only flavour text indicating preparations (pending state). Is there something more than the 75% influence that's needed?
Do we have to read Cthulhian quotes by candlelight to summon the Mi-go or something?
Or is there a mandatory wait period before expansion begins?
pending ("countdown") 5 days, active 5 days (if not cut short by a conflict), expansion happens on day 6.