Naruto: Paws and Whiskers - Chapter 221

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.

Confession school belle rejected? Reward the five thunders to rectify the law!

Confession of the devil’s beautiful tutor was rejected? Reward the Golden Light Curse!

Confession of the Wan Yao Queen was rejected? Reward Eight Wonders……

The confession was rejected, and was regarded by everyone as a negative example of not thinking about cultivation and indulging in personal relationships with children.

It wasn’t until he was rejected a hundred times that everyone realized that Lin Feng was invincible!

- Description from novelbuddy

Title: Multiversal Template SystemAlex was transmigrated to the body of a newly awakened mutant. The original owner of the body was also named Alex, Alex Locke, an ordinary college student. About a month ago, he suddenly awakened to a mutant ability and used it to escape unscathed from a burning building.Although he survived the disaster, there was no subsequent good fortune. A few days later, his parents discovered his mutant ability and, despising it, kicked him out of the house.He was then pursued by a mysterious organization and was accidentally abducted by gang members from Hell's Kitchen, ending up in this unknown underground prison.As for his mutant ability, it was a weak version of Sebastian Shaw's ability, which was the reason for him being captured. Just as Alex was despairing about how he will die just after transmigrating, a voice sounded in his ear.[ Congratulations, you have awakened the 'Multiversal Character Template System'! ][ You have obtained the character template: Gojo Satoru! ][ You have awakened the skill 'Six Eyes' lv1 ]“Oh...”A few hours later[ Template Fusion Rate: 5% ][ New Skill Unlocked: Limitless Technique ]

Xiao Ming, a junior in high school, experienced the whole life of a high-tech planet Pan Shaxing science and technology warrior after staying up late to watch a novel suddenly die.

Xiao Ming, who was dying to death, found that science courses have become simpler. In addition, he also has Pan Shaxing’s technology system.

At the juncture of the college entrance examination, he started a different life.
From sewage treatment technology to domestic operating system;
From neuron chip to anti-gravity technology;
From DNA repair shop to conscious upload server;
Every black technology that changed lives came into being.
I appeared on the cover of “Time” and asked for the front page of “Forbes”.

“Forbes”: “This man has a monopoly on the world, we can no longer calculate his value …”
Technology creates the future, Xiao Ming should be the future guide.

Xiao Xiaoming: “I’m sorry, I seem to have skewed the human tree of science and technology.”

- Description from Qidian