At the beginning of the Tang Dynasty, it was the era when Tubo rose and Tuyuhun perished.

From the ninth year of Zhenguan to the tenth year of Zhenguan, in less than a year, under the attack of the famous generals Duan Zhixuan, Li Jing, Hou Junji, Li Daozong and others in the Tang Dynasty, Fu Shun, the son of Fu Yun, the king of Tuyuhun, led the whole country to surrender to the Tang army, Fu Yun hanged himself, and Tuyuhun was attached to the Tang Dynasty. Fushun was named Khan, King of Xiping County, and Tuyuhun became a vassal state of the Tang Dynasty.

At the same time, Tibet began to rise.

At the same time as the establishment of the Tang Dynasty, Songtsen Gampo, one of the most important figures in the history of Tibet, also stepped onto the stage of history......

No one could have imagined that in the future, Tubo would become one of the great troubles of the Tang Dynasty, and even more than a hundred years later, they broke through the capital Chang'an!

It's just that in the twelfth year of Zhenguan, Tubo was just a small country in Li Shimin's eyes.

However, it is this small country that is still inconspicuous that the upper class has long begun to use a very precious health care product, that is, tea obtained from the East through war, trade and other means!

And the middleman of trade is Tuyuhun, who has now surrendered to the Tang Dynasty.

To be honest, in this era, Li Yuanjia always thought that he would become the inventor of roasted tea, and at the same time the pioneer of the tea trade in Chinese history. But not long ago, there was news from the south, that is, Tuguhun, as an intermediary, had actually begun to sell tea to Tibet!

What the hell is this......

The Ancient Tea Horse Road was opened in the early Tang Dynasty?

But no matter what, after hearing his words, Li Shimin immediately became interested: "What did you say?" Is Tuguhun selling tea? ”

"Yes, and it's to buy our Datang tea and sell it to the Tubo people."

"Huh."

Hearing Li Yuanjia's words, the emperor was immediately happy: "Tubo people? They had just united with the sheep to defeat Tugu Hun ah...... Ha ha. ”

Looking at the happy laughing royal second, Li Yuanjia was speechless for a moment.

Well, he's actually quite speechless.

Although the most important thing between countries is always interests, the country in this era is really faster than turning the book!

Before, Tuyuhun always violated the Great Sui and the Tang Dynasty, and after Zhenguan completely surrendered in the ninth year, it was the turn of Tubo and Yang Tong to clean them up. And hearing the name of Yang Tong, who has no impression at all, Li Yuanjia can be sure that it should not live long, and it should be destroyed by Tubo in a few years - anyway, he knows that as long as the other party does not attack the Tang Dynasty with death, Li Shimin should not send troops to destroy them.

One is disdainful, and the other is unnecessary.

Today's Datang territory is big enough, with such a small population occupying such a huge land, and the traffic is still the same ghost, Li Yuanjia doesn't believe that the Datang Center can really completely control all the corners and corners. Blindly starting a war for the sake of territory is very unwise for Datang.

What's more, as the "Heavenly Empire", I don't know how many pairs of eyes are staring at Datang around.

Before crossing over, Li Yuanjia also thought that diplomatic methods such as harmony were very cowardly and embarrassing things, but after coming to the Tang Dynasty to become a prince and studying with the teachers, he found that in fact, in the diplomatic system of the imperial court, this is actually a very common means used by the "Central Dynasty".

There are too many enemies around.

At the beginning of the Tang Dynasty, there was such a small population, controlling such a huge territory, and there were still groups of vicious wolves around, whether it was Tibet or Turkic, or Goguryeo in the northeast, which one could be easily defeated? This has nothing to do with whether the country has that strength, the key is that the road is too far, the environment is too harsh, and it is too difficult for the Tang army to conquer whichever one......

Thinking of this, Li Yuanjia couldn't help but sigh secretly: "Population! The most important thing is the population! If Datang now has a population of 100 million...... No, even fifty or sixty million people are enough! It's a pity that by the time of the Tianbao period, the population had risen, but various social contradictions had also reached the point where they could not be reconciled......"

At this moment, Li Yuanjia is really irritable!

Reading history from a book is a completely different feeling from being in history.

Whether it is the history class when he was in school or the history books he reads in his spare time, Li Yuanjia will regret and even resentment for the various wars and turmoil of the previous dynasties, but it is only a short-term emotion after all. But coming to this world and becoming a member of this era, in addition to the anger about what will happen in the future, in fact, Li Yuanjia himself knows very well that there is more of a fear and worry in it.

For example, his fear of Wu Zetian's wanton slaughter of the royal family surnamed Li, and his worry about the fate of his descendants in the future!

So......

"Agriculture, health care, and...... Industry! ”

Although Li Yuanjia's knowledge of history, economics and other aspects is actually pitiful, as a future person, he still knows how to solve Datang's problems after all, or how to solve Datang's future problems!

The most important thing is agriculture!

Only by producing more food can we feed a sufficient number of people. For example, in the Qing Dynasty in later generations, 400 million people were still able to barely survive, what did they rely on? The introduction of potatoes, corn and other crops has definitely contributed to it.

In addition to agriculture, there is, of course, industry.

Even an extremely backward handicraft industry can feed a large non-agricultural population, reduce social contradictions to a certain extent, and reduce the probability of future unrest.

In addition to this, there are also the developments in medicine.

Li Yuanjia didn't dare to say more, but he had the absolute right to speak in this regard. Now because of the restrictions of his identity, he really doesn't dare to let go of it, but as long as a few years pass, after the various means prepared by Li Yuanjia in advance mature, not to mention how much the life expectancy of the Tang people will be increased, but it is still possible to improve the survival rate of babies and pregnant women and save more lives with simple means......

"Eleven Lang? What do you think? ”

Just when Li Yuanjia's heart was fluctuating and his thoughts were full of thoughts, the emperor's question suddenly startled him.

Quickly straightened up, Li Yuanjia said in a low voice: "Your Majesty forgives me, my brother just thought of one thing just now, that is, Tubo is now just treating tea as a kind of ...... Well, as a superior ingredient, it has not yet realized its true function. I think if they know that tea is good for their health......"

"Hehe, what do you want to do?"

Raising his eyebrows, Li Shimin looked at his younger brother with interest.

"Hey, it's easy."

Grinning, Li Yuanjia showed a mouthful of big white teeth: "Since he doesn't know, then let's just tell them......"