Time flies, four years have passed in a flash, and the nineteenth year of Li Yuanji's coming to this world has quietly come.

When he came, he was just a twenty-three-year-old guy, but now, he has become a forty-two-year-old middle-aged uncle.

Although he holds the power of life and death in the world, in the past nineteen years, Datang has also undergone earth-shaking changes, but the further back he goes, the more tired Li Yuanji feels.

In four years, Datang has built nearly 10,000 transport ships and hundreds of steel warships, and the sea is full of Datang's ocean-going fleet.

All kinds of resources in the Nanyang region were continuously transported back to the Tang Dynasty, and these resources, under the distribution of the imperial court, were quickly invested in various places where they were needed.

What can four years change?

Within four years, the southern section of the North-South Railway of the Central Line was opened to traffic at the end of the second year, which means that Datang can contact the southernmost point, because of the decision made by Li Chengguang in the Annan area five years ago, so the railway can directly lead to the southernmost point of Annan, which was once privately established Nan'an County, has become the southernmost station of Datang.

In four years, the northern railway was also opened to traffic in its third year, and the construction of the northern line was easier in comparison, and the bridges needed did not require many mountains to cross.

The railway continued north through Shenzhou, but a railway line to the east was created here to connect the provinces of Korea.

The western railway, the Changhai Railway, has now been renamed the Yuhai Railway, as early as last year, connected the line between Yumen Pass and Chang'an, and the 400,000 construction corps is sweating on the desert to build the railway as far away as possible.

Where is the destination? No one can say for sure, many people only know that it took them six years to build less than a third of the way.

The only thing to be thankful for is that the strength of the construction corps has doubled, and the equipment and everything have also increased, and the construction speed will be faster.

And they also have a month of vacation every year, and they can travel home to visit their relatives on the railroad they built themselves.

Externally, the entry of massive resources has greatly stimulated Datang's nerves.

In five years, the scale of industry has tripled, and the average tax revenue in five years has exceeded 4 million, and the average tax revenue in the next five years is going straight to 10 million, because in the fifth year, the tax revenue has exceeded 9 million.

The local tax revenue is only about 4 million, and the rest is all the income obtained by the imperial court from overseas through maritime trade.

Ship out the low-priced goods of the local area, and then exchange them for high-priced resources, and then use these resources to lower the price of the local resources, although the selling price is reduced, but the court makes the difference, and this part of the difference is naturally included in the national treasury.

Increasing mining efforts can naturally make more money, but that is just a decision to kill chickens and eggs, so Li Yuanji did not increase mining efforts, but reduced mining efforts, and for local resources, he took the measures of proven, recorded, and sealed.

If you can find it overseas, use it overseas, and if you can't find it, mine it first.

This is a bit of a hassle, but it leaves a lot of resources for future generations, especially copper.

Ships of copper ore from South America and the South Seas were shipped back, and at the cost of weapons and armor, old-fashioned Tang knives, and old-fashioned Mingguang armor.

Fifty sets of equipment can be exchanged for a whole shipload of copper ore, and after all these copper ores are smelted, about 30,000 catties of copper can be obtained.

And these equipment, a small workshop with a scale of 200 people, using machinery and equipment, using the assembly line mode, can produce more than 2,000 sets a day.

They don't even have to produce at full capacity, no, they are not producing at all, but they take the equipment that the Tang Army retired ten years ago for renovation, and then this batch of refurbished equipment is directly shipped overseas.

The armed forces of the overseas royal families have been strengthened, and their dominance has been further enhanced, but the opposition has a completely different kind of equipment in their hands, although it is not as elite as the royal armed forces, but the gap is also limited, except for the lack of armor.

Naturally, this is something that Datang is secretly doing.

Luo Yueguo found out about this matter and questioned Datang, but the question did not get any response, Datang only said that it would be investigated, but after checking and checking, this matter was over.

In the fifteenth year of Shenyuan, a mob of 3,000 people attacked a company of troops in the gold mine of the Tang Dynasty in Luoyueguo, and twenty minutes later, the battle ended, and the 3,000 mob was killed by more than 2,000 people, and the rest fled in all directions, and the Tang army did not even let them approach within 100 meters of the position.

A company of four heavy machine guns, plus hundreds of rifles, eight rocket launchers, and eight 30-mm portable guns, suddenly knocked the opponent into a daze.

It was only at this time that they knew the true strength of the Tang Army, that army that did not have a sword or armor, had such a strong equipment.

So, Nanyang is honest, the number of garrison troops in various countries varies, and small countries like Luo and Luo Yue have only one battalion of garrisons, but it is enough.

The Buddha Country, the Heling Kingdom, and the Bori Kingdom each had two regiments of garrisons, and although the number was small, it was by no means something they could bully at will.

Deterrence by force, coupled with diplomacy, and counting the appearance of the Tang fleet three or four times a month, the entire South Sea is peaceful, and there is a taste of harmony everywhere.

However, for these countries, it is not without changes, and the advanced farming experience of Datang has also been passed here, and the most advanced Yuan Rang plough has also arrived.

Mechanized production of the kind of high-tech, and not fun guys, or stay in the country to let the local people have a headache, this kind of convenient operation, the speed is fast, of course, to give priority to overseas people.

Then, several countries close to the Tang Dynasty, what Linyi, what real wax, what Gogu Luo country, what Luo country, what Luo Yue country, the power of Datang has begun to enter here, this entry refers to the fact that the currency of Datang can already be circulated here, plus the entry of Qianzhuang, convenient, fast, safe, trouble-free, several major aspects add up, plus the political pressure of Datang, and military threat, these small countries certainly have no confidence to resist.

As a result, they can only agree to use the Tang currency in their own country, in fact, they don't have any large-scale currency at all, and even most places live in the ancient era of barter.

In Southeast Asia and the Americas, Datang's currency has become a universal currency, and although it has not been fully rolled out in some places, it is also recognized by both parties for settlement of large transactions.

And five years have passed, and at the end of the seventeenth year of Shenyuan, Li Chengguang is already eighteen years old, and he is about to enter the age of nineteen, and Li Yuanji's expectations for him are also stronger.