After Capt Jack told me that new techs can be made that have a prerequisite of other techs, I decided to take his advice and make a new tech suggestion for increasing port population.
Urban Development(originally called housing development)
cost-gonna make it simple and suggest it has identical cost to political science
time-same as political science.
Prerequisite-Political Science level 20.
effect- each level boosts population gained in port by influence by 2%. so at level 20 it would be a 40% increase.
this would make increasing population in ports with low population much easier, until trans would be worth the cost.
feel free to make any suggestions to it, and if you have a better name, please feel free to share.