My Special Ability Is Perfect Replication - Chapter 321 - All Captured At Once, the World Goes Ape

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 striking man of mysterious origin and peerless talent, he looks back at the world, in all its entirety, with utter disdain. And yet, in the treacherous and unpredictable ultimate formation of the Boundless Secular World, he guards a breathtaking ancient qin with broken strings, waiting silently for the destined one to arrive!

Alex was just trying to escape his dead-end job and overbearing family. Then the System arrived, bringing with it magic, Rifts, and the chance for ordinary people to become extraordinary. Unfortunately for Alex, his stats started out as unimpressive as his old life. But when he gains the unique trait {Primordial Will}, which only allows him to put his free points into one stat, everything changes—though not necessarily for the better.Thrown into a dangerous Rift way above his pay grade, Alex quickly discovers that surviving the chaos isn't just about having powerful skills. He'll need every ounce of his Willpower and resourcefulness if he wants to make it out alive and bring home the rewards that could finally give him an edge.This series follows Alex as he begins to master the art of Mana Threads and creates a revolutionary new magic system with Spell Circles. He starts to realize that magic isn’t just a tool—it’s a path to power that few can fully grasp. But with the world’s governments struggling to contain the rising number of superhuman threats, Alex will have to navigate more than just monsters and Rifts. In a world where “might makes right,” who really calls the shots?