Inside the Cave of Obscenity - Chapter Volume 1 6: Knights 1

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.

Gao You transmigrated into a parallel version of the Northern Song Dynasty in Dream of Splendor. At the very beginning, he married Zhao Pan’er in a grand wedding ceremony.“Pan’er, isn’t your husband supposed to be a fool?” Sun Sanniang asked. “How did he manage to enrage Ouyang Xu to the point of smoke coming out of his ears?”“If brother-in-law is a fool, then there are no smart people left in the world!” Song Yinzhan said.“Can a fool write a medical book for the ages? Can he reclaim the Sixteen Prefectures of Yanyun?” Fan Zhongyan asked.“This is clearly the royal son I lost and have now regained!” The Emperor said.

On the surface, he was striking and dashing, an object of envy and resentment from all men, but in secrecy, he was the formidable figure that made powerful leaders tremble. A marriage contract had brought him back to the city,In the bustling metropolis, a man fierce and enigmatic like a tiger, watch as he forged his own legend!

Read the first 10 chapter and you will like it..All of humanity—billions of souls—were forcibly transported into 《Global Lord》, a merciless game-world where each person becomes a Lord and must fight to survive. Most cried. Most begged. Most died.But Lucas Nightveil was different.A war mongrel with a thirst for carnage, Lucas thrived in blood and madness. While others struggled to build wooden huts and gather firewood, Lucas awakened the [Dark Crypt]—and with it, her.Selena Draculea, the Vampire Queen. Elegant. Overpowering. Sadistic. And above all—loyal only to her King.While the rest of the world was still learning how to train peasants, Lucas was already unleashing Death Knights, Blood Moon Archers, and Shadow Banshees from his evolving Lair. With Selena by his side, he painted the lands crimson with the blood of Lords, monsters, and gods alike.He didn’t want peace.He didn’t want justice.He only wanted war.“In the night, there is no mercy—only my will.”— Lucas NightveilAs his Night Empire rises, the world learns one eternal command:“Bow to the Vampire Queen. Or be devoured by her King.”