Super Dimensional Wizard - Chapter 84: A Young Man From Versailles

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 13-year-old deaf teenager living in the 21st century suddenly found himself as a young boy in Japan during the early 1900s. With two World Wars, two nuclear bombs, Hitler and many other disasters awaiting his future, he thought things couldn't get worse.Except it did.He found out later on that he had actually reincarnated into the world of Demon Slayer where man-eating demons ruled the night. He thought things couldn't get worse.Except it did.But hey! At least he had unparalleled talent, incredibly special eyes and future knowledge.How will the story of Demon Slayer change with the addition of this unique character? Will so many still die if the Hashiras had one more pillar in the final battle?Or will the story end on a much happier note?

In the class where everyone awakened to Class A, Rosen was violently attacked online for awakening to a Class D hero template.Fortunately, the awakened Class D template is a 'growth' template rarely seen in a thousand years.So what if others have a strong S-level template, they only have one skill for life, while I can use my Class D 'transform' skill on par with you!Not to mention upgrading from D to C, where I can awaken new skills, and the new skills are even more powerful!Continuously leveling up, awakening more skills.And as the level increases, the form also changes, evolving into monsters similar to those in 'Classic of Mountains and Seas'!......The class teacher and the principal, not recognizing talent like Mount Tai, persuaded Rosen to drop out. Rosen could only work at the crematorium to earn currency to buy Awakening Stones, temporarily enduring for a month.Coincidentally, other forces ran rampant, killing their classmates who awakened to Class A and Class S.Thus, Rosen discovered several familiar corpses appearing in the crematorium...Facing the corpses of those who bullied him while they were alive, Rosen chose...