More Nation-states
In earlier times, diplomacy was a relatively simple and straight forward process. It has since become more difficult and complicated. At one time – if you dealt with the British government, you were essentially dealing with all of Britain’s dominions, colonies, and protectorates. Now, all of those “others” are now countries and they need to be contacted and dealt with individually.
The world now has 193 recognized countries and that makes diplomacy much more difficult and problematic