Mob Protagonist ~ Mob in the Novel But There is a Problem - Chapter 43.1: Current Masatoshi

Lin Ping'an traversed to a High Martial World, where the Ten Thousand Races invaded, leaving the Human Race weak and on the brink of danger. At this critical moment, he awakened the Civilization Master System.He simply created countless speedy Demonic Cultivation Techniques that spread widely, causing the Ten Thousand Races to exclaim how truly bizarre they are.[ Painful Demon Body ]: The longer the cultivation time, the faster the Qi Blood grows, but the more painful it becomes.[ Qianyuan Burning Life Technique ]: Burns life to gain strength, living like a summer flower, blooming with momentary brilliance.[ Celestial Demon Dissolving Technique ]: Burn all of oneself to unleash the strongest combat power.[ Abi Dao Three Blades ]: Bound by Demon Thought, eternally falling into Abi, the three blades extinguish ghosts and gods.[ Heaven-Defying Seven Demon Slash ]: Soul destroyed with no regrets, protecting the Human Race, slash slash slash slash slash slash slash.[ Life-Burning God-Slaying Arrow ]: Soul as the guide, life as the arrow, one strike for the fall of the demon emperor.Emotionless Swordsmanship... Dao Heart Demon Planting Technique... Blood God Technique... Sunflower Manual... Blood Escape Technique... Soul Destruction Nine Palms...

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.

Henry is a university graduate who happens to be working as a hotel receptionist, though with big dreams of being more than that. All these change for good one day when he finds a way of cracking a very sophisticated technological system, which ultimately empowers him to formulate and develop leading-edge inventions from his bedroom.With a determined mind not only to conquer the market but also to move out of his gray life, Henry starts into his journey of fame by introducing a number of radical technologies that capture the interest of the whole world and hold it.

Kazuki’s life was painfully average—just another cog in the nine-to-five grind. His only escape? Binge-reading novels and no-lifing video games.Then he woke up inside one of those novels.Armed with unstable morals, unhinged humor, and a penchant for pettiness, Kazuki is determined to survive, thrive, and maybe cause a little chaos along the way.The world has no idea what’s coming.