I Really Don't Notice - Volume 2, Chapter 2 - Playing Exorcist

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.

This is an alternate history. Decades after the fall of the Eastern Jin Dynasty, the world is still in chaos, although there is hope for reunification.

IntroductionQiankun Wenqing Valley: After Tang San successfully defeated the God of Destruction, he planned to take action himself and begin taming Huo Yuhao...Suddenly, a mysterious black hole appeared, sucking all the creatures from the Douluo Continent and the God Realm into the plane cracks!Then, a comparison live broadcast appeared, revealing the vastly different lives of two Huo Yuhaos!Huo Yuhao in the Original World: As a child, he was bullied by the Duchess and Dai Huabin. During his time at Shrek Academy, he was deceived and manipulated. Even though he had a girlfriend, he could only look at her but never touch her! His surname was even changed in the finale! Controlled by Tang San like a mere pet, his life was nothing but tragedy.Huo Yuhao in the Parallel World: From a young age, he took control of his own fate—beheading the Duchess, defeating Dai Huabin, and escaping the Duke’s palace with his mother! He saw through the corruption of Shrek Academy in time and led everyone to flee together. As an adult, he took revenge personally, killing the scumbag Duke White Tiger! He destroyed the seal Tang San had placed on Wang Donger’s body, allowing her to give birth to a child, and when Tang San came to settle the score, he cut him to pieces...Original Timeline Huo Yuhao: “After comparing myself with him, I finally realize what a failure my life has been. I want to be like him. I refuse to be a coward any longer! Tang San, die!”Disclaimer: This is translation

An underprivileged prodigy, a cruel, ruthless world, and an epic story of battle and conquest. A young man with an exceptional inheritance leaves the small, rural city from which he hails on a journey to find the girl of his dreams. He defeats countless prodigies, sweeps through all forces that dare to stand in his way, and progresses step by step toward the pinnacle of all the worlds!
“I’m not targeting any gods in particular. All I’m trying to say is that all gods are trash in my eyes!”

- Description from Novelupdates