MTL - Martial God Conqueror - Chapter 56 : Lingfu Fuding

A 30-year-old NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters!

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.

Ian Night’s life was a joke—until it wasn’t.Betrayed, discarded, and left with nothing, he welcomed death when it came. But fate had other plans.Reborn in chains, Ian awakens as a slave in a world where power is dictated by bloodlines and magic.While others wield fire and lightning, he is given dominion over something far more absolute: Death.With every slain foe, every stolen soul, and every corpse bound to his will, Ian will carve his way from servitude to supremacy.He will rise from the dirt. He will shatter his chains. And those who once cast him aside will learn what it means to fear the dead.[Ability Unlocked: Soulbind – Bind the fallen to your will.][Absorb strength of fallen soul?][New Trait Acquired: Gravewalker – The dead whisper, and you listen.]Kingdoms will tremble.The weak will kneel.And Ian Night will never be a failure again.Or, like most in this cursed world, he’ll die trying.

The days where adventurers would roam the land and grow strong are long gone. More than 99.9% of the world's population is level 1, and in fact, leveling just isn't something people think about anymore, as almost every spawn point on the planet has been gone for close to a thousand years. Only the elites, the super rich, or the super lucky have access to spawn points, and because of this, they are like Gods among men: like superheroes. For people like Zach, life is a mundane, ordinary experience of getting up, going to school, working, and then going back to bed. But that's all about to change when he stumbles upon one of the only unknown spawn points in existence. And in doing so, his life is about to descend into a wild chaos he never could have expected. (Lit RPG, fantasy, action, slow burn)