I’m the Boss Who Modified the World - Chapter 13

In the waves of steam and machinery, who could achieve extraordinary? In the fogs of history and darkness, who was whispering? I woke up from the realm of mysteries and opened my eyes to the world.

Firearms, cannons, battleships, airships, and difference machines. Potions, divination, curses, hanged-man, and sealed artifacts… The lights shone brightly, yet the secrets of the world were never far away. This was a legend of the “Fool”.

- Description from novelupdates

“Want to know the meaning of life? Want to live… a real life?” The world changes when you click YES. In God’s dimension, you have to keep getting stronger, keep evolving to survive one horror movie after another. Do you kill everyone in your way to reach the end as a lone king? Or fight along with your comrades and survive through the support of friends? Everything was just for staying alive. Until you find the secret of God’s dimension. Who is the real enemy?

Chen Mo was told by a fortune teller that he had a suffocating aura, and was ordered to commit murder, and then inexplicably traveled to a world of high martial arts and became a fake eunuch serving the queen’s concubine in the harem of the Song Dynasty.

One day finally ushered in his golden finger…

Immortal Cultivation Simulator!

[Choose the talent to complete, do you want to start the simulation? 】

“Yes.”

[Day 1: The great turmoil came, and the horns of uprisings were raised throughout the Song Dynasty. The sky is dead, and the yellow sky stands. You are in the palace, which is the safest place in the Song Dynasty. You are ready to grow up in a dreadful way, and then surprise everyone. 】

【Day 2: You were promoted from the third-class eunuch to the first-class eunuch by the empress. 】

[Day 3: A palace maid accidentally discovered that you were having an affair with the Empress, and you died. 】

…

- Description from novelbuddy

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.