My Simulation… Why Is It Turning into a Real Romance?! - Chapter 27 — One Punch from Taki and I’m Dead

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.

[Complete 1V1 Pure Romance] Zhong Xiaoxiao had transmigrated. When she opened her eyes, she found herself on her wedding night, “You might as well prepare to be a widow.”Before she could understand what was happening, her cheap husband had fled, and she became the vilified and reluctantly married country bride. Life is like a dream, but one must carry on. So what if her reputation was in tatters? Rolling up her sleeves, she set to work with her whole family. When they met again, even if they couldn't get a divorce, acting as a fake married couple was still an option, right? However, as she continued to pretend, she actually fell... [New recommendation “Reborn Husband Tender Wife”]

Caden Ryder.Having both the status of a Transmigrator and a regressor.Once a human from Earth and a ruthless domineering general of the Purple Continent.His journey through the mystical world was rough and filled with betrayals.Following the death of Emperor Rozen Riverrun and the rise of Emperor Zeraith Riverrun.Both eras brought about the rise of the Redmen Race.And the death of the Purplemen Race, in the end....After years of fighting, after years of defending the Purple Continent.It was all for nothing. But little did he know that his execution was the beginning of his journey.[Regression Alert!]Regressing back to the time when Kyle Freeman transmigrated into the body of Caden Ryder.Now amped with the knowledge of two past lives, with his determination to grow stronger.With the zeal to live the mundane and quiet luxurious life he has always dreamed of.Caden must walk the path of domination, the path of conquerors.Armed with a Primordial System. Armed with three SSS-Ranked Ultimate Skills.If he must conquer the Red Continent to live his mundane, quiet, and luxurious life.Then so be it, he shall conquer the Red Continent.With the knowledge of his past lives, walking on a path of mysteries and adventures.If there's no way. he will create a way

Shenwu mainland, Yangwu worships God. A generation of Tianjiao, Wu Sheng was born again. Too really water, refining the body. Boxing the world, feet and arrogance. The celestial emperor, the law is empty. “Dare to despise the brothers, all killed!” “The woman who dares to move the brother, has been sleeping!” “Brother is just a myth, no one!” – from the quotations of the Emperor Lingfeng. The Supreme Demon is a very popular fantasy fantasy type written by the author, and tells the vivid story of the Supreme Devil.

- Description from zhuishubox (translated)