Clearing an Isekai with the Zero-Believers Goddess – The Weakest Mage among the Classmates - Chapter 147: Takatsuki Makoto learns about the Goddess

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.

As the Martial Arts Emperor, live-streaming superstar, and kung fu megastar, Wu Li says: 'Sanda, boxing, judo, Muay Thai, Jeet Kune Do, karate...whatever you practice, in the martial arts there are just two words: one horizontal, one vertical; if you do it right, you stand; if you do it wrong, you lie down.'......When Wu Li gains a martial arts system and discovers that live-streaming is the way to get stronger,【The number of live-stream viewers breaks through a hundred thousand, gaining a hundred thousand fan points】【Spend fan points to upgrade Baji Fist to master level】【Spend fan points to exchange for the passive skill 'Muscle Man'】......Wu Li: 'When the whole world is watching my live stream, I am the strongest man in the world!'

Whenever our ship encounters a tenth-level storm, my comrades-in-arms will not have the slightest worry, because they know that I still have me on board.

- Description from Uukanshu

Nikola Tesla, the genius, a man who lost everything to balant capitalism and betrayal, awakens to find himself reborn as an orphan. What is this world? Why is he here? And will he once again fall for the capitalistic betrayal or pave his own way? What would happen if his genius adapts to cunningness of the society?