If we want to develop the social productive forces, we must climb the tree of science and technology, and this is an absolute truth that neither the left nor the right can deny.

However, in many YY novels that cross the farming stream, those heroes who are wise and decisive often come up with papermaking and movable type printing as long as they move their mouths, but a large assembly line factory is established in a few months, and flintlock muskets and rear-loading artillery can be made in a few years...... Modern Europeans have worked hard to climb the technology tree for one or two hundred years, but under someone's magic pen, it has been completed almost in the blink of an eye!

In short, the protagonists of these books are almost as if they all have a game system, as if they have pressed the upgrade button of "Rise of Nations": as soon as the "whew" sounds, as the foggy light curtain dissipates, the thatched house is gorgeously transformed into a marble palace, the barbarian evolves into a musketeer in the blink of an eye, the canoe suddenly becomes a sail battleship, and the blacksmith shop becomes a metallurgical factory......

In comparison, the slogan of "fifteen years to catch up with the United States in the United States" of Taizu of this dynasty is really weak!

In fact, for any social system, climbing the tech tree is a huge and complex task.

For example, if you want to evolve from the Stone Age to the Iron Age, you have to know how to fire refractory bricks, find iron ore, collect charcoal and coal, and work over and over again to determine the right furnace temperature and number of forges, as well as how to remove all kinds of harmful impurities from steel.

However, in an agrarian society with backward productivity, how large a population base and how rich a financial income do you have to support so many scholars and craftsmen who have been out of work for a long time, and to study new jishu that will succeed one day like a headless fly?

What's more, these huge resources that have been wasted needlessly in research can easily allow you to assemble an elite army armed to the teeth to conquer more territory and plunder more wealth...... If you were a ruler, how would you choose between the two?

The answer is obviously self-evident.

Therefore, before the industrial age, all kinds of jishu progress could only rely on the accumulation of experience of craftsmen and the occasional flash of inspiration.

In the same way, before the start of the Industrial Revolution, many seemingly simple jishu inventions in human history, such as stirrups, horseshoes, black powder, hydraulic mills, etc., all took a long time in centuries before they could go from germination to maturity little by little.

Fortunately, after having the time and space gate, all the above troubles can be omitted - just travel back to the afterlife, drive a Toyota pickup truck to a small hardware factory on the outskirts of the city, and there are all kinds of rubber tappers, fire axes, and watermelon knives.

Of course, watermelon knives and kitchen knives are not special-purpose weapons after all, in order to better enrich the armed liliang under the command of Wen Dehe, Wang Qiu and Ma Tong also ordered a thousand iron gun heads from a small hardware workshop in the name of making movies. Subsequently, in order to enhance the long-range attack Liliang, Wang Qiu got more than 100 javelins from the sporting goods store, although the head of the gun is blunt, but as long as it is sharpened a little, it can also be turned into a sharp killing weapon.

Next, as long as you go back to the library and get a pile of yellowed old books at the price of scrap paper, all the necessary knowledge for primary industry and modern agriculture is ready-made - the only trouble is that the Indians in Mexico do not know Chinese at present, and how to implement all the industrial and agricultural jishu on paper can only be slowly figured out by Wen Deji and others......

Fortunately, there are too many gaps that the Indians need to fill in in terms of civilization upgrading. With a little brains, the time-travelers can basically raise the level of civilization of the Hongshutizgan Kingdom to the level of the early feudal era. …,

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Weishenme American civilization when European colonizers invaded, how could it behave so vulnerable? Even the blacks of Africa are far inferior?

The reasons are many and complex, but they can be summed up in four words: geographical isolation!

For the development of every civilization, communication with other centers of civilization is indispensable. For example, wheat and barley in Mesopotamia, rice in southern China, and iron-smelting by the Hittites spread throughout Eurasia through constant exchange.

The American continent, on the other hand, is inherently deficient in the spread and exchange of civilizations due to its geographical isolation. The geographical isolation from the Old World meant that the civilizations of the Americas, which were forced to develop completely independently, had too many gaps in the key jishu of the tech tree - no wheels, no vehicles, no sailing ships, no cattle and horses, no smelting of copper and iron, and the rudimentary script (Mayan script) was lost after its invention......

It is difficult to transport without wheels, difficult to sail without sailboats, difficult to record and disseminate knowledge without writing, and impossible to defend against the sword of the Spaniards without copper and iron...... How can an American civilization with so many low-level jishu gaps compete with the well-trained Europeans?

Now, the traversers have come to this shijie through a two-way portal with a large number of modern industrial products, and easily filled the above-mentioned low-level jishu gaps for the Indians, and then created more high-level jishu gaps - for example, at this time, the Hongshutizgan Kingdom has already ascended from the primitive obscurantist Stone Age to the sky in just a few days, and directly entered the green and pollution-free solar age......

-- In order to solve the problem of night lighting for Wen Dehe, Wang Qiu and his family got several solar street lamps from later generations.

Obviously, from grinding stone tools to producing solar panels, such a huge jishu gap will take dozens of generations to fill it.

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Looking at the solar street lamps that are projecting dazzling light in the thatched hut, his wife Maca who is smiling and threading needles and threads and mending clothes under the lights, his sister-in-law Tia who is diligent in learning Chinese characters with a stack of literacy cards, and the tablet computer that is playing the latest Batman movie in his hand, as well as the steaming bowl of Master Kong's spicy beef instant noodles on the table, Wen Desi couldn't help but feel like a world away for a while.

――Crossing in the true sense of the word is never fun!

For a modern person who lives and grows up in a highly electrified and information-based modern society, and is accustomed to all kinds of advanced industrial products and electronic entertainment, if you really want to go back to the past, even if it is only in modern times 100 years ago, you will feel more uncomfortable than dying!

As for the Mesoamerican Indian tribes of the Stone Age, not to mention it.

Imagine having no soap, no toilet paper, no clean drinking water, no medical treatment, and the possibility of hanging up if you catch a cold in the rain...... For many people, the mere absence of online games, new anime, and Hollywood movies is enough to make him miserable.

Thankfully, after the arrival of the compatriots of the later generations, everything slowly got better.

In the interdimensional space-time trade, it is both a good thing and a bad thing for the shippers who work tirelessly to travel through time and space as a compatriot who knows the roots of modern shijie and is thriving in different shijies, as the full agent of the local market.

The advantage is that in this way, it means that the space-time trade has ready-made translators and distributors in the other world, and there is no need to worry about how to carry out the "first contact", how to successfully break into the local society, and will not be regarded as a devil by the natives, and even the most basic communication cannot be carried out. …,

The disadvantage is that this first-time-traveler, based on his own interests, is unlikely to condone the misdeeds of his compatriots from the modern shijie, making it difficult for them to make huge profits by using the bad methods of deception and abduction, let alone pretending to be a god and tricking the natives into paying tribute - unless they can take this time-traveler together to fool other unrelated people.

Although in a sense, this first-step-traveler is equivalent to the comprador who was responsible for dumping industrial products for Western colonizers in the Republic of China, which can almost be equated with a "traitor". But the problem is that he, the comprador, is exclusive, and the entire space-time channel exists because of him. The shipper can't bypass him in any case, let alone change someone to act as an agent, otherwise he can only break up and never do business again.

Therefore, in the midst of constant bumps and bumps, this series of commodity trade across time and space has basically been successful.

Wang Qiu and others made more than 200% of the windfall profits, and obtained many coveted gold, silver, and precious stones.

As a result, he and his family have enjoyed many conveniences of modern life: brilliant and smooth colored porcelain, sharp and hard steel tools, brightly colored modern fabrics, sweet and tempting sweets, light and comfortable plastic slippers, and modern medicines with miraculous effects...... All of them are the good things that were highly sought after by the Indians of the 16th century! And, unlike what Mr. Bundeji had imagined, the plastic slippers, which he considered to be basically superfluous, were the most popular commodity among the Indians!

――In the 21st century, few people in the modern world go out barefoot except at home, and almost no one actually walks through straw sandals, so they don't know the benefits of slippers...... Seriously, if you've ever experienced the pain of walking barefoot in straw sandals, the pain of the rough blades of grass rubbing against the soles of your feet, the comfort of even the cheapest plastic slippers will make you want to cry.

In the 16th century, the Indian tribes not only had not yet invented socks, but not too many people could even wear straw shoes, and the more luxurious moccasin shoes were completely the preserve of the great nobles. And realistically speaking, the plastic slippers produced by modern large industries are probably still on top of handmade moccasin shoes in terms of comfort and service life, not to mention straw shoes that are prone to moisture and mold.

In addition, slippers can be transformed into sandals by simply putting on a sturdy rope, which may look a bit rustic, but for Indians who don't even have shoes, this layer of protection will at least allow them not to worry about being suddenly pierced by sharp stones, and it will also prevent a careless kick off their toenails...... In a primitive society with an extreme shortage of medical treatment, even such a small wound caused by a bacterial infection, when unlucky, can often kill a strong man!

As a result, as countless products of modern industrial society poured into the kingdom of Hunghyutizgan, all kinds of gold, silver, jade and jewelry, like a river bursting its banks, poured out of the hands of the people of Hungshutizgan.

However, even the vast expanse of the lake will be dried by the scorching sun.

What's more, a small and impoverished country with a population of only 20,000 people, no matter how much money it loses, how much gold and silver treasures can it muster?

So, just a few days later, the flood of gold came to an abrupt end

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