After the United Sovereign, Olympus visited the Tang Empire. Then Olympus declared a vote on the Ancient Level Tower as well.
Olympus was the last faction that visited the Tang Empire. The remaining big factions remained in their section. The Whitney Kingdom and The North Federation were too prideful to take the same approach.
The Mecaya Kingdom and Kingdom of Napoles never had contact with the Tang Empire before. They decided not to approach, afraid they would be rejected. The last big faction, The Kingdom of Sand, had a hostile relationship with the Tang Empire. They would never approach the Tang Empire.
With those declarations, there would be seven hundred votes for Ancient Level Tower. The decision would be in the hands of the medium factions. Of course, Zhang Mengyao had played their cards to influence the medium factions.