Imperial Settlers: We didn't Start the Fire

From the publisher:

They crossed our border first! This Empire pack introduces a new concept into the world of Imperial Settlers - Conquest! When you conquest, you move the border between your empires and that means that you can take the left most enemy Faction card from any row and build in in your Empire! It’s time to grab their land! Remember: You didn’t start the fire!

This is not a standalone game. The base set of Imperial Settlers is required to play.