I'm Very Happy After Marrying the CEO Husband According to the Agreement - Chapter 3: Man and Man, Wilrigod.

Cao Xin, a young man on earth, died in a car accident, traveled to a troubled world where supplies were scarce, and obtained a “Bronze Immortal Gate”…

…

- Description from novelbuddy

I traverse along the pathway of darkness and imagination…

Entering the realm born by human imaginations…

Challenging Harry Potter’s magic, commanding the great Pirates of the Caribbean.

Terminating the Terminator’s strength, tearing apart the Matrix’s Hallucination.

Virus is my slave.

Endurance my inheritance.

Growing and hunting in the boundless universe.

Breaking through boundaries in a mysterious space.

Desiring evil, conspiracy and betrayer. Who can redeem what was already lost?

In a battle of demons, who can leave an immortal legacy?

A declining Trump card, Final evolution!

I’m… on a journey!

We are one!

- Description from Novelupdates

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.