The treaties of Rome were signed by the 6 member countries of the ECSC. By signing these treaties the EURATOM and the EEC were formed. These two new "communities" greatly expanded the economic integration, that had been started by the ECSC, of these countries. These country's economies were now joined in most areas, not only by their coal and steel policies. This was important to the development of the EU because by bringing these countries economies together in new ways, it cleared the way for the EU to integrate Europe in other new ways, economic and otherwise. Furthermore, the signing of The Treaties of Rome led to activities, such as the opening up of the trade market between these 6 countries, that later became important job carried out by the EU across Europe.