The Savior is just a 3-Year-Old - Chapter 1549

A genius talisman practitioner is reborn as a seven-year-old girl! However, her innocent appearance belies her vicious personality.

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.

One day, when a novelist woke up from a restless sleep,he realized that he had transformed into his 12-year-old self.

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~