MTL - Naruto’s Hidden Orphan - Chapter 185 Insane Squad.

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 piece of divorce paper sent Xia Xinghe into a state of destitution. However, a car accident later, she transformed into a professional hacker with more money than she could ever spend. All those that have belittled, bullied and laughed at me, please line up, I’ll show you what the meaning of face-slapping is! Wait, wait, wait. That guy over there, the ex-husband that I no longer have any relations with, don’t cut in line. What, you want to help me face-slap these people? “Not only that I will help you face-slap myself!” The wickedly handsome man with billions of dollar in estate raised his own palm to slap his own face without reservation!

- Description from Novelupdates

“You’re the Demon King?”

In response to the woman’s voice filled with murderous intent, the man opened his mouth.

“No, I quit that?”

※ Demon King & Hero will show you the absolute limits of chaotic storytelling.

Luan Hualie is just too pitiful! She was just playing a game when she was suddenly transported into another world to become the Young Miss. Just this is okay, but she actually doesn’t have the slightest bit of power!

However, at this moment she had long stopped being the originally powerless eldest young miss. Mythical weapons and pets in her hand, what is there to fear underneath the heavens?

She rose above the mountains and brought down the oceans, and even more so subdued great amounts of devil beasts and holy beasts!

When she swept away the entire continent with her powerful and imposing manner, who could tell she was originally that ridiculous eldest young miss of Lu Family?

He, the prince of Qin, a black-bellied little shotacon, played the pig to eat the tiger. In the midst of the collisions and crossing of swords, how did his mind and body fall into enemy hands?

He, the spawn of the devil, slaughtered and felled the whole world. Without heart, without emotion, without desire. A long contest, countless fights. Why did a brilliant ray of light start to penetrate that frozen world of his?

He, the beautiful man saved from the slave market, obviously had excellent martial arts. Yet, how was he reduced to the most inferior slave? Faced with her salvation, why were his thoughts in a whirl?

And there was still him!

- Description from Novelupdates