She Rebuilt Her Fallen Country With Storage Space - Chapter 10 - : Crown Prince Needs a Bear Skin Back Cushion

An underprivileged prodigy, a cruel, ruthless world, and an epic story of battle and conquest. A young man with an exceptional inheritance leaves the small, rural city from which he hails on a journey to find the girl of his dreams. He defeats countless prodigies, sweeps through all forces that dare to stand in his way, and progresses step by step toward the pinnacle of all the worlds!
“I’m not targeting any gods in particular. All I’m trying to say is that all gods are trash in my eyes!”

- Description from Novelupdates

You boiled two eggs, Culinary skills +1.

You chewed a mouthful of cereal, your jaw is strengthened.

You are riding a bicycle, driving ability +1

you gazed at the beauty, your mood is very pleasant, your kidney function has been strengthened, Appraisal ability +1.

You see elderly women dancing in the public square, you can’t help but want to swing with their rhythm, dance skills +1.

You glanced at the newspaper, your reading ability is strengthened, knowledge experience +1.

You sneezed, your disease resistance has improved.

You took cold medicine, toxin resistance is improved, medicine proficiency +1.

You observe nurse use injection, your basic medical skills are strengthened, medical skills +1.

…… I don’t know what’s going on, my strength is improving even if I’m drinking cold water. I don’t want to stop, but I’m so worried…

- Description from Novelupdates

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.