World's Strongest Became the Game's Weakest Villain - Chapter 412 - 408: Key

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.

The world was destroyed by meteorites and everyone on Earth transmigrated to a wasteland.The wasteland would encounter an unpredictable catastrophe every seven days. Some of the catastrophes included the great flood, ice age, invasion of demonic beasts and plague of plants.In order to survive, mankind had to build more advanced shelters.Lin Yue awakened the 100 Percent Drop Rate System, allowing him to live a very different life from the others.Other people lamented, “The drop rate is too low, isn’t it? I have killed 50 mutants, yet I still have not gotten any drops!”Lin Yue lamented, “I have way too many drops and my item list is now full. Could it be that I have to upgrade my shelter and build a warehouse for all the drops? Tsk. That’s so troublesome.”

Our protagonist, Xu Yi, is born with a silver spoon in his mouth, able to live a happy and worriless life. However, he wasn’t able to enjoy this life for long, as the revenge of his family’s enemies quickly caught up to him.The enemies are much more powerful than Xu Yi; therefore, he has no choice but to be obedient. However, forbearance is not always a good policy. The enemies take advantage of his passiveness and bully him even more. These little sparks of anger have finally become an uncontrollable fury for Xu Yi, compelling him to seek revenge.

Wei Chi transmigrated to the Nine Continents of the Celestial Realm. Initially, he was prepared to just be an honest third son of a family. However, after a turn of events, he had no choice but to inherit an entire divine cultivation plan.From then onward, his vibe changed a little.When he saw a girl with decent talents, he immediately asked, “Girl, are you interested in divine cultivation?”In the blink of an eye, 10 million years had passed.Numerous top-class empresses flew through the sky and showed up in front of Wei Chi.Wei Chi wailed and yelled,“I really don’t have any more cultivation methods!”“Please stop coming here!”“You’re all grown-ups now!”