For the tribes that know the strength of the Xia Kingdom, it is very likely that they will join the Xia Kingdom under the threat of war in the Xia Kingdom, such as forcing the Deer Tribe, the Mountain Tribe, and the Rabbit Tribe to integrate into the Dragon Tribe in the early days of the Dragon Tribe.

The Xia Kingdom has been in contact with these tribes for a long time, and some superficial things still need to be maintained, and the Xia Kingdom will not directly send a large army to force each other.

Salute first and then soldiers, first send invitations to these tribes, do not accept the invitation, and then use force to coerce, under force the other party does not accept the invitation and does not move, will send a large army over.

In Su Yan's eyes, soon the Yellow River Valley will belong to the territory of the Xia Kingdom, and the other tribes have only three choices, one is to stay away from the Yellow River Valley, one is to join the Xia Kingdom, and the last one is to be destroyed by the Xia Kingdom.

As for the tribes that have not been in contact with the Xia Kingdom, they do not know the strength of the Xia Kingdom, and most of the time they will choose to fight or flee.

However, Xia Guo will also avoid taking this road as much as possible, after all, many of the captives obtained in the war will be reduced to slaves, even if they are good to slaves, many slaves will have hatred for Xia Guo in their hearts, which is also a hidden danger.

What the Xia Kingdom lacked were adult citizens, not slaves.

In terms of population, we will keep these in mind and add them in the future, and then we will continue to do so.

Su Yan thought about it, took agriculture out of science and technology, and listed it separately, agriculture does have the qualifications to list a separate item, and the importance of food is self-evident.

Thinking that the Xia State wanted to rule the entire Yellow River Valley, Su Yan listed shipbuilding technology as the first item in scientific and technological development.

Because of the appearance of boats, the Xia Kingdom was able to cross the Yellow River valley and trade with other tribes in the Yellow River valley to obtain people, cattle and horses, animal skins, and so on.

Shipbuilding technology has always been a key development project of the Xia Kingdom, from the small boat that the Dragon Tribe crossed the source river to the Eagle tribe at the beginning, to the A-type boat that can sail smoothly in the main trunk of the Yellow River, and then to the B-type boat with faster speed and larger body, now the improved speed of the A-type boat has appeared, and the speed of the improved B-type ship will not be long before it will appear.

With faster ships, Xia will be able to reach farther through the Yellow River, where there are more people waiting for Xia to collect, and there are many resources that Xia needs to trade.

But in Su Yan's opinion, even if the speed improvement version of the B-type ship is built, it is not enough, and Xia Guo also needs better ships.

Xia Guo's ships have always regarded safety and stability as the key development direction, and on this basis, it is necessary to consider allowing ships to carry more goods and allowing ships to have faster speeds.

In the "First Five-Year Development Plan of Xia Kingdom", Su Yan listed faster ships as the direction of development, and with faster ships, Xia Guo will be able to expand to the outside world faster, in other words, time is life, and time cannot be wasted on the road.

The problem of ship load is put aside for the time being, as long as a larger ship is built, the problem of load capacity is easy to solve, but the larger the ship, the speed will also be limited, and the largest ship B type ship currently owned by Xia is enough for internal transportation in Xia Kingdom.

At present, Xia has two shipyards, namely Yuancheng Shipyard and Zhoucheng Shipyard.

Yuancheng Shipyard can build three A-type ships per year, including the improved version of A-boats, limited by geography, Yuancheng Shipyard can not expand too much, the potential is relatively low, in the future will only build no more than the size of A-type ships too much, there will also be a large number of smaller than A-type fishing boats, the use of fishing boats in the river fishing efficiency is higher than that of fishing on the shore.

Zhoucheng Shipyard can build three B-type ships every two years, Xia Guo has all types of ships can be built in Zhoucheng Shipyard, the current scale of Zhoucheng Shipyard has surpassed Yuancheng Shipyard, with more shipbuilders and workers, and at the same time, Zhoucheng Shipyard, located in the main trunk of the Yellow River, has a relatively high potential to build larger ships than B-type ships.

The "First Five-Year Development Plan of the Xia Kingdom" was to make the Xia Kingdom develop "planned" faster, and Su Yan felt that the ships built by only two shipyards could not meet the needs of the rapid development of the Xia Kingdom.

Under normal circumstances, the Xia state needed to maintain three fleets, mainly for foreign trade, and one fleet sailed westward along the main trunk of the Yellow River, mainly to trade with nomadic tribes on the steppe; A fleet sailed eastward along the main trunk of the Yellow River, mainly to trade with the tribes of the fishing tribes to the Xia region, and also to carry troops to wage war; A third fleet went further east to the fishing tribes to carry out foreign trade.

Three fleets, the minimum standard is ten A-type ships per fleet, as many as possible, and cannot be reduced.

For example, a Class A ship can generally carry twenty big cattle or horses, and ten Class A ships can carry two hundred, and the demand for cattle and horses in the Xia Kingdom is very large, so the number of ships responsible for trading with the nomadic tribes should be increased as much as possible, and more cattle and horses can be transported back in one trip.

The fleet that opens up new routes to the east should also increase the number of ships as much as possible, the new routes are farther away from the Xia Kingdom, and it takes two months or even longer to come back, the number of ships is less, the scale of the transaction is smaller, so much time is wasted in sailing, it is simply a waste of life.

At present, there are forty-eight A-type ships and eight B-type ships in the Xia Kingdom, minus the number of three fleets, the number of ships left in the Xia Kingdom is not much, and the number of ships traveling between the existing nineteen cities in the Xia Kingdom and the two new cities under construction is simply not enough.

There is also the matter of the Ministry of Transport and the National Holiday, which cannot be implemented without enough ships.

Therefore, Su Yan planned to build another shipyard within five years of implementing the "First Five-Year Development Plan of the Xia Kingdom" to increase the supply of ships to meet the needs of the development of the Xia Kingdom.

Shipbuilding technology was followed by iron-making technology, and before iron-making technology there was copper-making technology.

Xia Guo's bronze technology has reached a relatively high level, although it has not reached its peak, but it is enough for Xia Guo, to be able to cast a delicate bronze tripod, all it takes is to spend some more time.

Su Yan didn't have this need, so he didn't let Xia Guo mint many of these impractical things, and at most cast a few as decorations for the palace, or reward them to his courtiers.

The key is the issue of copper reserves, which are obviously not as high as iron reserves, and in ancient China, copper was used more as metal currency, and iron was the main material for metal tools.

Originally, Su Yan had the intention of letting Xia Guo master iron-making technology as soon as possible, but it was affected by natural disasters, and now it is officially included in the "Xia State's First Five-Year Development Plan" in terms of science and technology. ()

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