Why is the world divided territorially?

Territory is said to be one of the core elements of being a state. According to Merriam-Webster dictionary territory is a geographic area belonging to or under the jurisdiction of a governmental authority. If we follow the thought of this meaning then we are divided territorially because we being governed by numerous authorities. Our territory is defined by our government. Territory is not only defined in land but also in the seas.

Another reason, I think, we are divided territorially is because it is more convinient that way. If there is no division then we would need a central authority to govern us. Having a central authority will be so much taxing and it might even fail. Nowadays, governments are having diffuculties governing their country, even a small country is hard to 'maintain'. If this is happening then what more for a single government that will govern the whole world and all 195 states. We divide ourselves because it is easier that way. We are divided because, probably, no one wants to be the single authority of the world. Yes, states want to be the most powerful but not anymore with acquisition of territory and this is why no one will take the responsibility of being a single power of authority.

Also, we are divided because all states are sovereign. We already have chosen our territory or someone have already chosen a territory for them. We are divided as a respect and following the concept of sovereignty. We are divided and because of that we form our sense of independence, that we are different from those people across the other border. The world is divided territorially because sovereignty wants to preserve the identy of each states.

The world is divided territorially because we established our differences already. Such differences might be in our form of government, economy, or even our culture. Again, it would fall under convenience. We choose to be divided because we cannot see a stable world who is trying to be one. To be not divided territorially is to be one with others, meaning adopting only one form of government, economy, and even integration of cultures. This would be hard because we are only accustomed to the things we have now. A communist state cannot imagineitself to be federal and vice-versa. A rich state cannot see itself sharing its goods to very poor states who in return cannot give anything. And, lastly, cultures are very hard to impose to others. The world is divided territorially because being divided that way gives each state reasons to stay independent, free from foreign ruling, or even free celebrating and practicing their own cultures.