As Sukuna in Invincible - Chapter 66: A day in a Mohawk’s life

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.

Jian Heng, who lives in the United States, only wants to make enough money and return to China to retire happily. Unfortunately, by accident, he becomes a poor rancher!

Fortunately, he has an unknown cheat. From then on, Jian Heng started to run his own small ranch, and at the same time added some private goods, so that the group of American guests who came to the ranch adapted to the self-created Chinese style’ There are forceful living habits.

The new book “Small Peasants in the Great Era” is released, welcome everyone!

- Description from novelbuddy

[The 34th Galaxy Award for Best Online Novel][The No.1 on the Science Fiction Literature IP Adaptation Value Potential List (2023)][The Best Chinese Science Fiction Online Novel]…Have you heard?When the night is deep and silent, if you open your music player, put on headphones, curl up under the covers, and cover your head, listening to the same song on loop.After the loop has played forty-four times and you fall asleep, if you’re unlucky, when you open your eyes again, you will no longer be lying in your own bed, but will have entered a bizarre space completely isolated from reality.That space… on the surface, it appears to be places we commonly see, such as one’s own bedroom, the living room at home, the underground garage, the bathroom, the basketball court, construction sites, etc., but if you observe carefully, you’ll realize that everything is different…everything.====This is the story of an ordinary person, named Common, who after acquiring supernatural abilities, gradually transforms and grows in an alternate world, ultimately reaching the pinnacle of their experience.

Fang Shen’s eyes undergo perplexing changes after being hit by thunder. The change helps him acquire inscrutable and powerful life-death eyes which are able to launch many functions like clairvoyance. With the superb and magical eyes, he can dominate the world.

- Description from Novelupdates