Advance
The Navigation Acts
These acts represent the apex of mercantilism. Trade must be conducted with our ships and pass through our ports first, where we will collect customs duties and any other applicable taxes.
EnglandCountrypotential
Great BritainFormable CountrypotentialAdvance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Absolutism tree itself.
Modifiers
Export Efficiency+2.5%