I Have a Mansion in the Post-apocalyptic World - Chapter 1551 - The Second Contact

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.

Once, because of a pair of purple eyes he was scorned. He is a wangye known across the land, cold and bloodthirsty, looking disdainfully upon the world.

That night, she shed off the image of a young maiden’s immaturity, forming a ripple in the deepest parts of the Cold Palace…

That day, she kneeled before him begging for mercy. She didn’t want anything. She only wanted to leave the palace and become an ordinary girl….

A bunch of elegant and good looking heavenly princes. A lowly palace maid with a mind as calm as still water.

If they were to meet, would it be an encounter like dewdrops and the autumn wind or would it be a lament of a country…

- Description from Novelupdates

What would happen if an ordinary guy on Blue Star became a Superman?Traversing between worlds, Lu Yao becomes the only one with extraordinary powers. He studies cultivation in the other world, and bring them the technology of his planet. Now, he is the only superman in both worlds.A small goal— to withstand a nuclear bomb~