Starting with Check-In Sacred Body of the Ancients - Chapter 170: You Are the Protagonist of Heaven and Earth? Heaven and Earth Itself Must Submit at This Divine Child’s Feet!

In an era when the power of Fire Magic was considered to have reached its limit, one girl began researching nuclear fusion.

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.

Married for three years, they appeared to be deeply in love in public, but behind closed doors, he treated her with cold indifference.Having had enough of his neglect, she handed him a divorce agreement and left him.Unexpectedly, the usually aloof Chairman Xu began acting like a rascal post-divorce, visiting daily to mooch food and drink, and even wanting to share her bed?Outsiders all say, “Chairman Xu has deep feelings for his ex-wife, even after divorce he can't forget her and spoils her to no end.”