I'm trying to think of someway to "stake my claim" to territory, prior to founding a city. In civ3, a line of explorers/warrior could block of geographic bottlenecks and prevent friendly nations from settling "your" land. Now that friendly units can share the same space, this strategy won't work. I was thinking about adding a worker outpost ability which creates a culture border for that square only. Problem is, this seems totally unrealistic to me, and creates a serious potential for multiplayer abuse. Any suggestions on a realistic way to allow a player to 'claim' land?