Empire Size Constraints

It would appear to me, when looking at the extent at which empires expand, the most deciding factory is the size of the continent on which the empire is expanding on. The notion of continents as size constrains can be seen when looking at the vast size of the Russian, Chinese, and Mongolian empires in comparison to the European Empires.

Russia and China when expanding had vast areas of land in Asia over announce their control. One of the reason for this expansion very well would have been the lack of opposition. A reason though that there was a lack of opposition would have been the size of the continent, people in Asia found themselves much more spread out, than the close clustered people of Europe. The Empires of China and Russia when put together controlled around half of all of Asia, with some other states here and there filling up the rest of the space. Europe experienced similar situations like this, there had existed states that controlled large sections of Europe (I.e. Rome). But it is very rare for a country to have completely conquered Europe, with two really the only two examples being Napoleon and Hitler, but neither of these men were able to hold Europe for more than a few years. All of Europe as a single empire still would have paled in comparison to the size of the empires carved out by Russia and China. It appears that states have very difficult times conquering entire continents. As a result the size of states are relative to the continent on which they exist. Even today, there are 48 states in Asia, while there are 47 states in Europe. Even though Asia is over four times as large as Europe. This is because the states there on average are bigger because the continent itself is bigger. It is because of the continent being bigger that Russia and China were able to carve out massive Empires in Asia, with room to spare around them. These empires are bigger than anything that European nations could have dreamed of on the European continent, they had to go to other continents to compete, but very well may be similar to European empires at their height in comparison to percentage of the continent that is controlled by a single power.