In fact, this problem itself is somewhat suspected of false propositions.
It may be because in historical TV series or movies, any history that mentions the warlord chaos in the Republic of China period gives us a chaotic and unbearable impression. Many people may confuse the Beiyang government with the Qing government, after all, the incompetence of the Qing government at that time was obvious to all, and it is also true that there was chaos and darkness in the country when Cixi came to power. It's just that the Beiyang government is really not incompetent, although it is a scuffle and wants to restore, but the Beiyang government at that time was really a representative of China recognized by the world.
The seizure of power is basically the seizure of power by all parties involved in the seizure of power before they can initiate the seizure of power, corruption will certainly occur, and the powerful Beiyang government is not as "incompetent" as later generations say. Therefore, this land is not something that Japan can encroach on if it wants to, and there are many reasons for this.
Starting from the international environment at that time, in fact, Japan could not bite the cake of China - after all, Japan, as a rising star in the world, can only be regarded as a small country at best compared to the powerful countries in the West. But Japan does have great ambitions, unlike other powers, which only want China to open ports and dump goods on China, because Japan, which has always had a small territory, is also very strong in its "survival desire", and is bent on occupying the territory of China, which looks weak next door.
But the world's great powers will not tolerate Japan's easy occupation of Chinese territory, after all, we big brothers have no idea of fighting China, how can it be your turn to Japan first? Therefore, it is not that Japan did not invade and occupy China's territory, but it is entirely because of the resistance of the Beiyang government, but because the world situation does not allow Japan to act arbitrarily, so even if Japan has this ambition, there is no way to act rashly.
At that time, in addition to Japan and Tsarist Russia, in fact, other foreign powers, without exception, only wanted to earn economic benefits from China, and if their economic interests had not been shared enough, this cake was swallowed up by Japan or Tsarist Russia, which they certainly did not want to see. So in addition, the foreign powers at that time also formed a situation of containment between each other, and you did not move and I did not move, as if it was a convention.
Let's talk about the Beiyang government itself, the warlords at that time were in a scuffle, although they were divided into warlord factions such as Anhui warlords, Dian warlords, Fengzhi warlords, and so on, although they were fighting quite fiercely on the surface, they were actually very national and national consciousness. This has to start with Yuan Shikai, since Yuan Shikai, no warlord has liked Japan, because the warlord faction in the whole world knows that Japan has coveted the land of its own country for a long time, so naturally it has a very heavy hostility to Japan.
In fact, from a military point of view, if you want to fight, Japan may not be able to defeat the army of the vast number of warlords, after all, after invading the Qing Dynasty, Japan has focused its main development focus on the navy. If you go deep inland, the warlord's army is still very strong enough to compete with multiple rounds.
If you want to know more interesting history, it is interesting to pay attention to that kind of history.