Arguably the most important research in the game, Expansion allows the player to build Palaces, which are then used to create colonies on other islands. This is especially important if you started on an island that does not have marble as its natural resource.
Out there is more than just an ocean! More islands await being discovered. We are not alone! We can gain ground on one of the newly discovered island, tap new resources and get to know other peoples! And our clerks are eager to administer even more!