Demon Lord Management Sim Game - Chapter 259 – Showdown

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.

He is the great master of the Heavenly God Temple, under whom there are thirty-six Heavenly Stars and seventy-two Earthly Fiends, overseeing nearly half of the world's wealth.To uncover the secret of his origins, he holds a marriage certificate and hides away in the bustling city, becoming a live-in son-in-law that others see as living off his wife.His mother-in-law constantly mocks him and disapproves of the marriage, but little did she know that the world's richest man would visit personally just to leave a good impression on him.Ye Guichen felt helpless: Alright, I’ll come clean then...

[Interstellar+Spiritual Power+Pure Romance+Marriage First, Love After+Livestreaming+Gourmet Food+Disguises]Reborn overnight, Qu Tong cried to death; her vast wealth was gone, and she even ended up owing a billion in taxes.Stuck with a cheap husband her cousin didn't want who can't have children? Rarely comes home? And throws in an entire planet to boot?Qu Tong wondered if there could be such good fortune?She carefully guarded her full fertility value, perfunctorily yet sincerely playing the role of a big shot's dainty wife.She grew energy fruits and vegetables, fed them on schedule, and incidentally improved the food for the entire squad by taking care of their home.The Insect Clan attacked, His Highness was injured, ditching class to visit, pah! To check in.His Highness was too aloof; unable to charm him after a long time, she went online searching for strategies and even inquired about how to reasonably inherit all of her husband's wealth in the case of divorce.The next day, Si Yuting glanced at the top search trends, then looked at his guilt-ridden dainty wife and laughed, “That's difficult, considering I'm just divorced, not dead.”Well-behaved and clever in front of others, behind their backs she did nothing of the sort.When her shop was reported, she cursed everyone who dissed her in the comment section one by one and blocked them all, leaving the netizens stunned: “Who taught her to curse like that?!!”In the academy competition, the enemy lacked honor, ganging up to bully the weak; Qu Tong pulled out a potion, directly turned the tables, and kicked them all out of the competition—no one can play me for a fool.When encountering a Star Thief, Qu Tong reassured everyone, ”Don't panic, I'll go reason with them.“ Then she single-handedly drove her mecha, cornering the Star Thief: “This is a robbery, hand over everything valuable.”...One day.Qu Tong, holding her medical report, asked, “If I say I can reproduce asexually, would you believe me?”“Guess.”

Yang Dai, who was reborn in the third year of high school, was forced to enter the [Deep Domain] before he could be happy.

This is a world where gods and gods reappear and demons eat and kill mortals!

Myths are revived, animals and plants have been transformed into demons, foreign ghosts have invaded, and the status of human beings as the ruler of the earth is at stake. At this time, the mysterious [Deep Domain] came to the earth in the form of virtual games, bringing hope to mankind.

Yang Dai entered the deep domain to gain the ability to control the soul. Based on the concept of wretched development, he wanted to be a soul summoner, and he planned to form an army of souls first, and then explore the deep domain.

Unparalleled talent, the peerless genius of the dynasty!

The unparalleled demon king who is wreaking havoc on the world!

Covering the sky with one hand, the Patriarch of the Demon Dao who presses the right way!

When Yang Dai’s soul army appeared more and more terrifying names that shocked all beings in the two worlds, he also won the honorary title of Megatron.

Soul Master!

- Description from novelbuddy