HP: The Arcane Thief - Chapter 10: Savage Sorting Hat

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.

Throughout heaven and earth, I alone am powerful

The Spirit Network, known as【Deep Sea】 connected five continents as human civilization surged forward; yet, they were oblivious to the impending eternal night. With the Extraordinary Awakening, the edifice was about to collapse. Flesh is weak and pitiful, how could one ascend? The story began when Gu Shen, an ordinary youth, received a ruler that bore the truth. He peeled back the corner of this extraordinary world, becoming the largest moth among the thousands that dashed into the flames. If winter is coming, I will climb against the steps, overturn the thrones of kings, shatter the crowns of falsehood, destroy the scepters of injustice. I will become humanity's last, Bright Barrier.

After being betrayed by her family, Bai Meiyue found herself struggling in the flourishing age where zombies and mutant animals ruled. And that too with a big belly!Though people called her crazy for being stubborn, Bai Meiyue didn’t regret keeping the fruit of her one-night stand. What she regretted was not protecting her child and trusting those whom she should have killed at the very chance that was handed to her.In the eleventh year, Bai Meiyue lost her child and died while taking revenge on those who took her son away. However, just when Bai Meiyue thought it was the end, she returned two months before the beginning of the doomsday.Carrying the grudge of two lifetimes, she swore to make life living hell for those who harmed her and her son.With the heavens blessing her with a barter system, Bai Meiyue was intent on giving her child everything that he deserved.But why was the child’s father chasing after her?Hello? We only shared a bed for a night. So why was he clinging to her?Her child’s father: From the best medicine to education, you have given our child everything, Meiyue. But what about a father?