Shinji Matou at Your Service - Chapter 892 - : Hold Your Head High, Medusa

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.

The challenges a female cultivator had to overcome on her life journey were countless.

After getting hit by a car, Nolan thought death would bring him peace. But instead of resting in heaven, he wakes up in a world of gods and power.Reincarnated in the Academy of Heavenly Descendants, Nolan now finds himself surrounded by the heirs of mythological deities—each wielding divine power beyond imagination.But there's a problem: the body he reincarnated into is cursed.Without the ability to cultivate Divine Essence, Nolan is labeled as worthless, an outcast in a world where strength means everything.Just as he’s about to lose hope, a voice echoes in his mind:[Congratulations, Host Has Awakened The God King System!][Initial Bloodline Scan Beginning...][Scan Completed][Host Has Awakened the Power of Kratos, the God of Strength and War!]Equipped with a system that enables him to contract thousands of various mythological bloodlines, Nolan journeys across the limitless planes of existence, searching for the absolute power to achieve his ultimate goal—freedom!A path many have embarked on, but none have succeeded.

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