The Entire Mankind is Acting As Me, I Shall Secretly Build a Battleship and Shock the World - Chapter 38 - From the Perspective of the Entire Human Race! The Oddity of an Elite Contestant from Another Country!

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.

After failing to transmigrate to a proper cultivation world, Lin Zhengran woke up to find himself as a little kid… in kindergarten.With no other choice, he decides to fool the system by pretending to cultivate.[Today, you encountered a fairy descending the mountain. You must find a way to obtain the Pure Yang Elixir in her hand.]Lin Zhengran looked at the milk candy in his childhood friend’s hand.“Give me the candy. Do you need to go to the restroom? I’ll call the teacher for you.”The little girl, confused and innocent, handed the candy to Lin Zhengran.“Here’s the candy…”[Congratulations! Without lifting a blade or striking a blow, you successfully obtained the Pure Yang Elixir from the fairy!]

When she was ten, she said, “When I grow up, I want to be the President!”“It's impossible, but you can be the President's wife,” he replied.He gazed at her tenderly. His youthful eyes filled with deep affection, as if he wanted to give her the whole world.When she was thirty-three, due to a leak of military secrets, she was imprisoned for treason, and she saw his signature on the death sentence document.She finally understood that the so-called undying love was fake, and that power and status were the true goals.Love is just like a ghost—more talked about than seen....Reborn and back to the age of twenty, she opened her eyes and shouted, “I must be the President!”“But, Madam... Your husband is already the President,” someone said.She was stunned for only a second, then viciously replied, “Then I'll take him down first, and I'll become the President!”A man gently pushed open the half-closed door, chuckling softly, “Did I hear wrong? Sweetie, you want to... take me down?”

Gods and demons fought, the worlds collapsed, only eternal immortal realm, lasting in the world.

After eternity, a god of war named Zhao Yun condensed the heavens and the earth, recast the cosmos, from the blue to the earth, marked the eternal immortal realm, in the name of the god, the king is over the world.

Since then, what he said is a myth.

- Description from MTL