In fact, discovering Panama means much more than that. After owning Panama, www.biquge.info could not only use it as a base to sail to China and the Japanese kingdom on the other side, but also use it as a center to go north to attack the Aztec Empire in Mexico or the Inca Empire in Peru in the south.

It can be said that Panama is a transportation hub in the Western Hemisphere. It can not only open air routes to Asia, but also become a transit point for controlling Peru and Mexico. Peru, in particular, historically, the gold and silver plundered by the Spaniards from Peru were transported overland through the Isthmus of Panama to the Caribbean side of the Caribbean before being shipped back to Spain.

Now, Panama is about to fall into the hands of Marin, the gold and silver of Peru...... Well, Marin was going to take it "reluctantly......

As for the digging of the Panama Canal, Marin never thought of it. As for why? Of course, it's the difference in water level between the Pacific Ocean and the Caribbean Sea!

The difference in water levels between the Caribbean Sea and the Pacific Ocean on the other side of the Isthmus of Panama is more than 20 meters. Such a terrain was completely unsuitable for the construction of an ordinary canal, which had to be supplemented by mechanized large locks. This kind of huge lock, which requires high-power machines to lift extra-large gates weighing tens or hundreds of tons, is completely impossible to achieve with current technology.

Even if Ada had come up with a steam engine, Marin would not have chosen to build a Panama Canal that would require large locks. Because, the early steam engine that Ada made was not up to such a heavy task. Moreover, the steam engine has a long residual heat recovery time, and the steam boiler of many warships needs to be ignited an hour in advance, otherwise it will not run. If the steam engine controls the gate, it is estimated that the ship will die, and the cost is very high, and the safety is not guaranteed.

Therefore, Marin still planned to follow the example of the Spaniards and directly open up a land route. Anyway, the Isthmus of Panama is only a few dozen kilometers wide, and if Peruvian gold and silver were to be transported to the Pacific side, it would be possible for people to load the gold and silver in horse-drawn carts, transport them overland to the Caribbean side, and then change ships. Similarly, trade with China can also be referred to this example.

In the future, Marin planned to build a concrete road across the Isthmus of Panama, near the Panama Canal. The cement road is smooth, not afraid of rainy weather, and it can also facilitate land transportation.

You know, Panama has a tropical rainforest climate with a lot of rainfall. If it is an ordinary dirt road, once it rains, the carriage carrying gold and silver can easily get stuck on the road and be unable to move. With the cement road, it is much easier, not only can the transportation continue in the rain, but the resistance of the carriage is greatly reduced, which can greatly increase the speed of the carriage.

In the more distant future, if the steam engine and train are developed, Marin also plans to build a railway track on the Isthmus of Panama to use small trains to transport goods, which will be faster and easier.

Of course, the horror of Panama is much more difficult than that. What is even more terrifying in Panama is that there are many poisonous insects and mosquitoes, which are easily infected with a very terrible disease - yellow fever.

The mortality rate from yellow fever was high, and even in later generations, there was no "silver bullet" like cinchona cream to combat malaria. Therefore, in the development of Panama, yellow fever is the biggest threat.

This is why Marin chose Grenada as the first tropical colony, because without these poisonous insects and mosquitoes, people would not die easily.

In the late 19th and early 20th centuries, more than 30,000 people died from yellow fever and malaria (only a small number of people died from malaria because of the anti-malarial cinchona).

However, Marin also has a way to deal with this. That is, Marin intends to cut down all the trees around the land route through the isthmus, not even the taller shrubs!

This is because, Marlin knows, yellow fever is mainly transmitted through mosquito bites. And mosquitoes have a great characteristic - that is, they hide in the shade during the day. If you are exposed to the sun, you will die.

Therefore, during the day, mosquitoes generally hide in shady and damp woods, or in bushes near water. Wait until the sun goes down before you dare to come out and bite.

Marin had people cut down the surrounding trees and tall shrubs, especially those near the water. In that way, there will be a lot fewer mosquitoes with no place to hide.

When there are fewer mosquitoes, then build roads, and then engage in transportation, it will be much safer.

……

Moreover, Marin not only plans to cut down all the big trees and shrubs, but also plans to replace all the weeds on the roadside with wormwood, a miraculous herb that can naturally repel mosquitoes......

Wormwood is a kind of traditional Chinese medicine with many effects, which is found in the north and south of China, and is also found in the Mongolian steppe. Morrigan and Battle had brought some wormwood seeds with them and cultivated them in Marin's glass greenhouse.

In the previous life, in Marin's hometown, people liked to use wormwood very much, and they would pick wormwood and put it at home during the Dragon Boat Festival. In addition, in the summer, you can also light dried wormwood as a natural mosquito coil. Such natural mosquito coils can not only repel mosquitoes, but also be non-toxic and do not affect health. In later generations, many families with small babies at home, in order not to let mosquito coils poison the baby, there are more knowledgeable elderly people at home, they will choose to go to the countryside to pick wormwood, and the dried wormwood in summer is used as a healthy version of mosquito coils, which can not only repel mosquitoes, but also do not harm the baby.

Over the past few years, the few wormwood seeds brought by Mozhigen and Battle have been cultivated into large wormwood meadows. Wormwood is extremely viable and can be grown in both temperate and tropical zones (not in cold zones). Where there is wormwood, mosquitoes are not very happy to approach.

Marin's plan was to build a concrete road on the Isthmus of Panama. Then, in a wide area on both sides of the cement road, all wormwood is planted.

The smell of wormwood can make mosquitoes shy away. In areas of concrete roads surrounded by wormwood, mosquitoes naturally decrease. At that time, transportation in Panama will be safer......

Thinking of this, Marin patted his head with some remorse - he should have asked Columbus to bring some wormwood seeds and scatter them directly in Panama.

However, this is nothing, and it is not too late to scatter wormwood seeds when someone is sent to Panama to colonize Panama next time.

In order to get enough wormwood seeds, Marin decided to send enough people to collect as many wormwood seeds as possible in that wormwood meadow this fall for planting in Panama.

Even, Marlin plans that when the time comes, no matter which tropical colony is opened, wormwood will become a standard must-have plant for colonists. He planned to use a decree to force the colonists' houses to be covered with wormwood so that mosquitoes would not want to approach. After the harvested mugwort leaves are dried, they can also be lit at night and used as mosquito coils.

In the future, Marin relied on a variety of wormwood and the use of wormwood leaf smoked mosquitoes, so that when the colonists under Marin developed the tropical colony, few people died of the epidemic, which became a miracle in colonial history......