Open Borders (Civ4)

In Civilization IV, Open Borders is one of the treaties available for negotiation with other civilizations.
== Enabled by ==
Researching Writing makes the Open Borders treaty available.
== Good and Bad ==
=== Good ===
* Improves diplomatic relations.
* Allows units to enter the other civilization's territory without declaring war.
* Makes foreign cities accessible to your trade network, increasing commerce production.
=== Bad ===
* Can spark tension with other civilizations.
* Lets other civilizations map out your territory.
== See also ==
* Open Borders in other games
Category:Game concepts (Civ4)