Top Student at Their Peak - Chapter 204 - 104 Mathematics is Not That Simple... But It’s Not Hard Either!_3

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

Accused by his enemies, Tang Yin was led to a dead end and died at the hands of his enemies. Even so, fate gave him a new chance, and his soul traveled to a lower world, where he managed to reincarnate.His new body had no cultivation and no family either, so he was now a total cripple in an unknown world, with enemies lurking at his door.Yet, he is the proud Divine Heir, dubbed the 'Divine Son' of the Upper Realm. How could something so simple stop him?That is why he will forge his own path and rise again, this time by the hand of a mysterious power that belongs exclusively to him.'Even if I don't understand why I was chosen as Divine Heir, I will create my own path and forge my own power.' He thought.At the same time, a strange and mysterious system with an attractive power, which it said could help him complete his revenge, appeared before him.[You must become the Host of the Domination System][Do you accept?]

In Ten Heavens Domain, full of respected powerhouses, juvenile Ling Tian accidentally obtained a mysterious iron sword. He refined the Supreme Martial Dao, studied the Divine Spirit Array Laws, fought Ten Thousand proud and arrogant Heavenly Clans, and was undefeated! Seven Feet Sword Tip sweeps away the world, within the Ten Heavens, I am the Supreme God Monarch!

- Description from Novelupdates

Han Muye, who had exceptional comprehension skills, was reborn into a cultivation world. He joined a clan which specialized in swordsmanship. He then became the keeper who looked after the swords in the Swords Pavilion.

There were more than 100,000 swords stored in the pavilion. The keeper was tasked to clean all of them once a month.

When Han Muge cleaned the Qinghe sword, he acquired a hint of Sword Qi.

When he cleaned the Ziyan sword, he comprehended the swordsmanship, the Burning Plain, left behind by the original owner of the sword. He also acquired the Sword Qi of Burning Flame.

When he cleaned the Shanyue sword, he comprehended the teachings left behind by Master Boulder and learned the Mountain Sword Technique.

…

Han Muye built up his Sword Qi bit by bit during the past 60 years working as a keeper in the pavilion.

Throughout the 60 years, a disciple came to seek a sword in the pavilion, and he received guidance from Han Muye.

The Sacred Maiden from the demonic clan attempted to steal a sword from the pavilion, but in the end, she left dejected and empty-handed.

A swordsman came to challenge Han Muye, and he left with a broken sword.

…

60 years later, the Celestial World invaded the mortal world.

The disciple had become an exceptional Sword Deity. He wielded his sword and protected a part of the world.

The Sacred Maiden had become the demonic clan leader. She sent a letter to the Swords Pavilion and led her clan to fight against the gods.

The swordsman had achieved enlightenment in his swordsmanship. His Sword Qi rifled up to the sky.

…

The gods from the Celestial World loomed over the sky above.

Han Muye slowly stood up. 100,000 swords followed him as he emerged from the pavilion. His Sword Qi could be sensed from 30,000 miles away, and his Sword Will pierced through the realms.

He declared, “Today, I, Han Muye, will traverse the sky. I want to see who among the gods dares to invade this mortal world.”