Sumerians — you will have to start with a small settlement that can be founded by the river, for example, and then all the fun will begin. You will develop a settlement and a town, follow people and track their level of contentment, build buildings and do much, much more. Building construction in this game plays a very big, important role. So, depending on the saturation of the city with the buildings needed by the settlement, literally everything will change. People may be satisfied, or, on the contrary, not very, the amount of resources received may decrease or increase, and not only. You will have to build ziggurats, erect temples, set up residential buildings and work out everything to the smallest detail in the social sphere, and more.