Ninja World: I Have a Life Simulator - Chapter 214 - : The Rinnegan Was Transplanted by Uchiha Madara?

One day, a villainess came to the orphanage.“I absolutely can’t stand children!”“How can someone my age have a child? It doesn’t make sense!”“What’s so great about these little creatures that tire you out all day long…”Setting aside her dislike for children…Somehow, after she arrived, the children started gaining weight.“It’s all because of the contract, you know?”That’s what she says.While personally feeding them sweets she made herself.

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.

After his fall, the Duke who was distant with his wife and daughter recalled his memories of another world. With a new perspective on life, he swore to cherish and protect those two.

As a snake catcher, Xu Ying has always been honest and diligent, until this day, he caught a different snake…

On the first day of March, the land of China was full of incense, and the statues guarding various villages, towns, cities, states and counties woke up one after another to enjoy the sacrifices of the common people.

However, from this day on, the world has been in chaos.

This book is also known as “Ninety-six Cultivation of Immortals”, “Zero Zero Seven Also Cultivates Truth”, “Inner Volume”, “Rolling to Death”, “No one TM wants to fly”, “Good Pit”, “The Big Pit is Deep”, “Help Me Up” ” At the age of thirty-five, my fortune came” and “The Appearance of the Great Demon King Xu” and so on!

- Description from novelbuddy