In the next negotiations, Meng Tian and Meng Xingyuan had an overwhelming advantage. They persuaded – or oppression – to accede to Meng Yi's demands that the Qin state pay annual tribute, compensate the Qin people for their losses, open a trading site north of the Yellow River, send troops to protect the trading grounds, and the Xiongnu could only trade the Qin's living and production materials, and that war materials should not be traded.

In fact, Meng Yi could have gotten more benefits from the Huns, but he didn't do that, because he knew that the rabbit was in a hurry and bit people, and he couldn't push the other party too hard.

Soon after the negotiations, Meng Tian sent troops to the area north of the Yellow River in Hetao (in the area of the Wula Mountains in present-day Inner Mongolia), building castles and roads, and garrisoning them there.

The Xiongnu condemned this matter many times, but Meng Tian dealt with it. After a long time, the Qin Dynasty "justifiably" owned those lands. This battle not only brought a stable living environment to the northern region, but also provided a foundation for the development and development of the Hetao region.

The trade between the Xiongnu and the Central Plains became more and more. They traded their cattle and sheep for grain, salt, cloth, iron, and so on. In order to trade with the Qin Dynasty, many Xiongnu began to learn to speak Chinese and write calligraphy, which greatly accelerated the assimilation of the nation.

In the past, people mostly dipped bamboo sticks in ink and wrote on silk cloth. This is not only slow, but also inconvenient: if you don't have enough ink and can't write a few strokes, you have to dip it again, and if you dip too much, the ink will drip and stain the silk cloth.

Once, Meng Tian went out hunting and came back from hunting a few rabbits. The tail of one of the rabbits dragged to the ground, dragging some traces of blood on the ground. Meng Tian's heart moved, cut off a rabbit's tail, inserted it in a bamboo tube, and dipped it in ink to try to write. But the rabbit's tail is too oily to absorb ink, and the handwriting is not good.

Disappointed, Meng Tian threw the "pen" into the stone pit. A few days later, he stumbled upon the "pen" in the pit that he had thrown away. After picking it up, Meng Tian pinched the rabbit fur with his fingers and found that the rabbit fur was wet and the coat color became white and soft. Meng Tian immediately ran back to the barracks and dipped it in ink. At this time, the rabbit's tail was able to absorb enough ink, and the writing was much smoother, and the font appeared rounded.

It turned out that the water in the pit contained limestone, and after being soaked in alkaline water, the rabbit fur became soft. Therefore, Meng Tian is also known as the "ancestor of the pen".

In order to further defend against the Xiongnu and other ethnic groups, Meng Tian ordered to connect the original Great Wall of Qin, Yan, and Zhao together, and further strengthen it, and also built fortresses in dangerous places that were easy to defend and difficult to attack. The Great Wall built by Meng Tian stretches from Lintao (located in present-day Minxian County, Gansu) in the west to Liaodong in the east, stretching for more than 10,000 miles - this is what we call the Great Wall.

Meng Xingyuan was originally opposed to the construction of the Great Wall, believing that this project would not only increase the burden on the people and hurt the people's labor and money, but also could only be passively defended and seriously lacked mobility. Therefore, the purpose of his visit to Qin Shi Huang was to ask Qin Shi Huang to give up the idea of building the Great Wall.

However, after actually participating in the battle with the Xiongnu, he realized that building the Great Wall was the best way to deal with the nomads in that era. Therefore, he gave up his original idea and actively helped Meng Tian build the Great Wall.

In the process of building the Great Wall, it is common to send someone to depict a topographical map of a certain place, then design a construction plan, and finally the actual construction. Since many of the places have never been visited before, mapping the topographic map is not only dangerous, but also slow and time-consuming. After Meng Xingyuan learned about this, he took the initiative to take this responsibility.

From then on, no matter where the topographic map was needed, Meng Xingyuan would take it out the next morning, neatly, clearly, and never make a mistake.

Meng Tian asked him more than once, and Meng Xingyuan always smiled and didn't say anything. Everyone is about to think of him as a god. Only Meng Xingyuan himself knew that this was a problem that Ah Feng could solve by taking him around at night.

After recovering the area south of the Hetao, Meng Tian was ordered by Qin Shi Huang to build 44 county towns near the Yellow River, relocated the people from the interior to live there, implemented the tuntian system, and diverted water from the Yellow River to irrigate farmland. This is the first time that the northwest region, including the Ningxia Plain, has been developed.

Since Mengtian, the people of Ningxia have successively built a number of canals such as the Qin Canal and the Han Canal in the east of the river and the Hanyan Canal and the Tanglai Canal in the west of the river to irrigate their land, forming the Yellow River irrigation area in Ningxia and planting various crops. It was precisely because of Meng Tian's acquisition of the Yellow River and the Hetao Henan that conditions were created for Ningxia's economic development and prosperity. Therefore, Meng Tian is also the first person in Ningxia's agricultural economic development.

At that time, the Qin Dynasty was surrounded by many minority regimes, in addition to the Xiongnu in the north, there were Sushen, Fuyu, and Donghu in the northeast, Yueshi in the northwest, and Qiang, Wusun, and Loulan in the west.

While Meng Tian and Meng Xingyuan were fighting against the Xiongnu, they also sent troops to attack other ethnic groups. First, they could be contained and could not support the Xiongnu; second, the political power of those nationalities was small and narrow, and defeating them was only a matter of convenience.

There is no war, and people are farming and producing with confidence. Most of the people on the border migrated because of the orders of Qin Shi Huang, and a small number came here voluntarily to "pan for gold". They brought with them more advanced production tools and technologies than the local ones, which led to the rapid development of these regions.

Qin Shi Huang also followed Meng Xingyuan's advice, not only exempted the tax here for three years, but also issued various "subsidies" to the people. This made people from all over the country want to settle down here, and there was even a scene on the official road, where people brought the old to help the young, and the whole family went north. So much so that Qin Shi Huang had to give another order to stop the continuous inflow of people.

Meng Xingyuan wrote again, imploring Qin Shi Huang to reduce taxes elsewhere as well. Qin Shi Huang also readily agreed. All of a sudden, people all over the country were smiling, as if they were celebrating the New Year.

There are more and more praises for Meng Xingyuan among the people, and there is even a saying that "he is the reincarnation of a god and comes to the lower realm to save the people". Meng Xingyuan was not stunned by these "high hats", but remained humble at all times.

When he wrote to Qin Shi Huang, Meng Xingyuan always wrote Meng Tian's name in front of him, no matter how clever his opinion was, he said that it was General Meng Tian's idea. When facing the people, he always put Qin Shi Huang first, and even if it was a small favor, he repeatedly told the people that it was Qin Shi Huang's reward.

Therefore, from the local area to the imperial court, no one came out to embarrass Meng Xingyuan.

If there is a conflict between the people of the Central Plains and people of other nationalities, Meng Xingyuan and Meng Tian will not be partial, and they will be dealt with according to law. This made all the tribes happy and faithful to them.

Everywhere in the northern region is developing rapidly, almost one day at a time. There are more and more houses, the crops are getting greener, and the cattle and sheep are getting fatter......

Meng Xingyuan looked at such a change, and a strong sense of pride arose in his heart, and he would laugh even when he dreamed at night. The next morning, I will always be laughed at by Ah Feng.

Meng Yi went back with huge results and went back to recover his life. In front of Qin Shi Huang, he praised his brother and Meng Xingyuan greatly. Qin Shi Huang was naturally overjoyed and gave Meng Tian and Meng Xingyuan a lot of rewards.

Although Meng Xingyuan didn't care about any money, all the things he needed, Ah Feng would help him get them. However, Meng Xingyuan did not distribute the rewards to the people around him with great fanfare, because doing so was easy to be regarded as buying people's hearts and cultivating henchmen. He just quietly gave it to those who needed it, and no one knew about the good deeds he did.

Just when Meng Xingyuan put all his thoughts on leading the military and civilians to vigorously develop and build, Qin Shi Huang sent someone to send a hundred thousand urgent holy decrees to summon Meng Xingyuan back.

Meng Xingyuan thought about it for a long time, but he couldn't guess what would happen. He asked Ah Feng again, but Ah Feng couldn't say. Resisting the order and disobeying it was a capital crime, and Meng Xingyuan had no choice but to explain everything to Meng Tian, get up and go back to Xianyang.

Because of some entourage, Meng Xingyuan and Ah Feng could not use mana, so they could only sit in a carriage and slowly walk towards Xianyang on a sunny morning.