Zhanxian - Chapter 819: Danger Of The Demon Sealing Formation

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.

A 30-year-old NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters!

Qin An was a former senior grim reaper who retired after serving the underworld for thousands of years. Because of his outstanding service and had enough merits, he was given a chance to become a human and unexpectedly transmigrated to the Interstellar era. But, how can he live his retirement days when has no money and everything? So, Qin An entered a reality talent show for idols and became an existence that everyone admires to.

Everyone said Su Xiaofeng from Lihua Village was lucky, despite having two kids to drag around, she still married a big shot from the Imperial Capital, making everyone green with envy.But the truth was this:In the 21st century, Su Xiaofeng, a leftover woman who started her own business, died unexpectedly while pregnant and was reborn into the body of a village girl from the 1990s.Right after arriving, she discovered the shocking news that she was pregnant.Touching her chin and then excitedly patting her stomach, Su Xiaofeng said, “It's like finding what you've been searching for without any effort at all.”To ensure that after the baby's birth, she could do whatever she wanted, Su Xiaofeng rolled up her sleeves and got to work, and by accident, she obtained a Spiritual Mirror, renowned for its wealth and beauty.From then on, she went further and further down the path of stepping over Lianhua, tearing apart local thugs, torturing her unkind mother, and beating up big shots... wait, no, on the path to getting rich.Only, her twins were beginning to look more and more like a certain big shot from the Imperial Capital.This story is fictional; rigorists beware!