Vassal liberation independence declaration conditions are currently as follows: Vassal for X turns AND one of: 1. number of cities 75% or greater than when vassalage started. 2. population is 300% or greater than when vassalage started. 3. number of cities is 60% or greater than the number Master's cities. When are options 2 or 3 ever going to be the case before 1 is the case? In fact, I can see 1 always happening before X turns unless the Master buys the Vassal's cities or the Master is in a losing war with a 3rd civ.