The Countess Lives Twice in the Apocalypse - Chapter 12: Eleven

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.

Three-and-a-half-year-old little girl, also known as Ann, lived a life of scarcity and hardship in an orphanage, where even a single steamed bun could lead to beatings and scoldings from the headmaster.Just before Ann fainted from hunger, a mysterious and domineering daddy from a wealthy family descends from the heavens and took her home.President Qin sneered, “I will make them pay a thousandfold for the suffering my daughter endured.”With six doting and influential elder brothers:The Youngest Brother was responsible for beating people up.The Second Brother was responsible for saving lives.The Third Brother was responsible for fighting lawsuits.The Fourth Brother was responsible for capturing people.The Fifth Brother was responsible for providing financial support.And the Eldest Brother was responsible for salvation.With comprehensive and attentive service, are you afraid or not?The major prestigious families competed to stand up for the little prodigy: To bully Ann is to challenge the entire Qin family!Even the pet, a wise and future-seeing white goose, refused to be outdone: Protect Ann!Ann stood with hands on hips and said, “Stop arguing, line up properly, and listen to me.”The Qin family: Understood!

This is the story of how I became the greatest genius in the history of humanity, destined to go down in the annals of history for all eternity!This is the story of how I made humanity what it is today.It all began on a fateful night in New York. With a certain peculiar dream.The Universe is grand and mysterious. What's important remains hidden...

After marriage, his little wife openly stared at other men at the ball!It seems that the family is not strict, directly take home a good education!