I'll Teach You, Marianne. - Chapter 697 - Starting Over

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.

One day, a door to another dimension opened all over the world.

“Channel”

At the same time as the channel opens, different races appear on Earth, and mankind awakens its magical talent.

But…? Yoon Min-joon, was able to use magic long before the channel opened.

The forced escape of a reclusive loner who was once the only wizard on Earth.

“It’s dangerous outside the house.”

The afterglow of the Middle Ages has not yet dissipated, but the best times have come.

The protagonist travels through Edward VI of the Tudor (duo) dynasty in the 16th century, centralizes power, rebuilds the parliament, and establishes the United Kingdom of Britain. It will take you to experience the most powerful dynasty in Britain, the dawn of the empire on which the sun never sets.

“With each stroke, a river and a sea are painted, and with a brush, mountains and rivers are determined.Some people admire a painting depicting a fierce ox toppling a mountain and comprehend the profound martial art technique called 'Crushing Mountain Force.' With boundless strength, one can move mountains barehanded!Others gaze upon a sword shining with a cold moonlight in the painting, thus realizing the 'Cold Moon Divine Sword Art.' With this sword, they can slay otherworldly beings and gain fame that resounds in all directions.Li Changqing, a top woodcarver, transmigrates into the world of Cangyuan. He discovers that his woodcarvings are more enlightening than his paintings. From being a destitute and worthless painter, he rises to the pinnacle of the Cangyuan world.In his previous life, he indulged in sculpture and ended up raising a wayward child. However, in this world of Cangyuan, he has a well-behaved and filial son who lacks talent but dreams of becoming an immortal through cultivation.If my son wants to become an immortal, then as his father, I will help him achieve it!However, Li Hengsheng, the son, begins to suspect that his useless daydreaming and money-begging father may have been possessed by someone else!”