At this moment, Zhu Yuanzhang, who was outside the door, could not help but assume that the Yangtze River and the Yellow River flowed from the north to the south.
It was just a slight deduction.
Zhu Yuanzhang realized the seriousness of the matter.
If it wasn't for the Yangtze River and the Yellow River as natural moats.
There would not be Da Ming at all.
At that time, the entire Guanzhong Plain would be completely open to the cavalry of the grasslands.
The Tartars on the grasslands did not even need to consider where to enter the pass.
Because if that was the case, they would not be able to build a pass at all.
The iron cavalry of the grasslands could invade Shu from the west of the river. If they invaded from Yanzhao, they could even take the Central Plains!
And all of the Great Ming's current passes would lose their effectiveness after losing the Yangtze River and Yellow River as natural moats.
The Tartars who had lost the shackles of the Yellow River, during the heavy snowfall every winter.
They would almost instinctively choose to go south for the winter!
It was warm in the south.
Because there was food in the south!
When that time really came.
The strong city cannon that Da Ming was proud of.
It would become meaningless.
Those things were just a strong city.
At most, I'll go around you. The river is gone. Can you still attack halfway?
Without the obstruction of the Yellow River, the cavalrymen on the grasslands could travel freely in the Central Plains.
Moreover, the Tartars wanted food. You couldn't possibly grow food in the city, right?!
After crossing the Yellow River, the natural moat was even more so.
Since ancient times, there has been a saying that guarding the Yangtze River must guard the Huai River.
The natural moat was effective because the fortified cities in Jiangbei were like bridgeheads.
They could attack the enemies from the north who were preparing to cross the river on a large scale at any time, causing the enemy to be attacked from the back as soon as they crossed the river.
The result was that the rear army would be in chaos, and the front army would be attacked halfway.
Since ancient times, no one who has abandoned the Huaihe River has guarded the Yangtze River, which is the reason.
However, if the Yangtze River flowed north-south, these things would disappear.
The dynasty of the Central Plains would become a fish on the chopping board, a huge granary.
They allowed the Tartars in the north to ravage them until the people were in dire straits.
He continued to deduce.
Who would care about the so-called Confucius and Mencius, loyalty, filial piety, and righteousness?
The warehouse is rich and knows etiquette. If you can't eat, how can you talk about righteousness?
All social moral standards gradually evolved into the cruel law of the jungle.
At this point, Zhu Yuanzhang did not dare to continue thinking.
What Zhu Yuanzhang didn't know was…
On the other side of this Continent, there was once an Empire that was as powerful as Great Qin.
They also created a brilliant civilization and established the most perfect social system in that era.
It also had the most powerful national strength in the world.
As such, they had also made the same decision as Great Qin and built a Great Wall at their borders.
They called it the Roman Wall.
However, they didn't have the Yellow River natural moat, or it was also the will of the heavens. The will of the heavens destined this piece of land to be in pieces.
Not to mention the river that flowed from east to west.
They didn't even have a decent river.
Therefore, less than 300 years after the Roman wall, the Germanic people from the north captured the capital of the Roman Empire.
And that was the closest that land had ever been to unification.
History said that the barbarians had destroyed Rome!
Liu Bowen and Zhu Yuanzhang had both experienced war, so they were also well aware of the military deployment of the Ming Dynasty.
Therefore, they were more shocked by Qin Zhan's geographical determinism than the children in the classroom!
Without a doubt.
Qin Zhan's lesson was definitely a success.
As a lesson.
The most important thing was to arouse the students 'interest.
The moment Qin Zhan said this so-called national fate theory…
It attracted almost all the vassal kings in the classroom. Everyone could not help but hold their breaths.
He was afraid that he would miss any content!
It seemed to have started in an instant.
The geography textbook in front of him was no longer a geography textbook.
It was the heavenly secrets!
Even Zhu Yuanzhang, who was standing outside the door.
They all wanted to go in and borrow a textbook to take a look at how Mount Kunlun rose from the ground.
How did the will of the heavens tell the world?
And Qin Zhan's theory.
In fact, it did not conflict with geography. After all, the earliest geographical origin of this country was feng shui.
A long time ago.
The ancients had already discovered that the fate of a country was inextricably linked to its geographical environment.
However, due to their limited knowledge, they did not know that the natural economy was bound to be limited by the geographical environment.
Therefore, they couldn't explain what they saw, so they could only come up with the theory of feng shui.
Qin Zhan's intermittent voice came from the classroom.
Zhu Yuanzhang did not notice at all.
She was already fascinated by Qin Zhan's words.
Until Qin Zhan's last sentence,"Class dismissed!"”
Only then did he pull Zhu Yuanzhang and Liu Bowen back from his own world.
At this moment, Zhu Yuanzhang was already convinced that Qin Zhan had descended from the immortal world.
It was definitely the Immortal World!
Otherwise, how could he explain Qin Zhan's knowledge?
This was definitely not knowledge that ordinary people could grasp!
This book comes from：m.funovel.com。