Otherworldly Desert Dust - Chapter 4 - 2: Shh! Don’t Make a Sound_2

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.

Religious and cultural schisms wreak havoc on its internal politics, while revolutions are brewing in neighboring kingdoms. The aristocratic houses play endless power games amongst themselves, and the Emperor desperately abuses what little influence he has left to keep his rivals down.Amidst all of this, Arnold von Hohenfels, first son of the Margrave of Hohenfels, finds himself in the unfortunate position of having to attend the Imperial Academy, a notorious battleground of wits and brawn for ambitious young nobles.Armed with a magical gift that is as much a blessing as it is a curse, he must learn to navigate the treacherous waters of aristocratic entanglements. In the name of his family’s ambition, he must represent House Hohenfels' interests in this microcosm of Imperial politics, deal with his formidable enemies, form alliances of his own, and somehow keep his brash cousin Friedrich out of trouble.Frankly, he would much rather be anywhere else.

Drunk, I lie on the lap of a beauty; awake, I command the power of the world.From being unknown to dominating the world, when Lin Fan looks back on the path he has traveled, it is all laid out by beautiful women!

“O, Hero!” With that cliched line, Kazuya Souma found himself summoned to another world and his adventure–-did not begin. After he presents his plan to strengthen the country economically and militarily, the king cedes the throne to him and Souma finds himself saddled with ruling the nation! What’s more, he’s betrothed to the king’s daughter now…?! In order to get the country back on its feet, Souma calls the wise, the talented, and the gifted to his side. Five people gather before the newly crowned Souma. Just what are the many talents and abilities they possess…?! What path will his outlook as a realist take Souma and the people of his country down? A revolutionary transferred-to-another-world administrative fantasy series starts here!