Kami-sama no Memochou - Volume 9, Chapter 7

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.

(Chongwen, strong men and women) On the wedding day, her husband stabbed the knife of betrayal into her heart with his own hands,

“Did you know? The person who saved you back then was not me, but the sick child who first asked Tian!”

Only then did she know that she had been in love with the wrong person!
In the raging fire, she vowed like a ghost:

“Sikong Hao, I swear to God that if there is an afterlife, I will seize your imperial power and destroy your country!”

Opening her eyes again, she found that she was actually reborn on the body of Bei Gongxue, the number one waste material of the Bei Gong family.

Clenching her fists, she hooked her lips and sneered: This time, she will not be blind and love others wrongly.

To the person who harmed her, she directly tramples on it, and to the person who loves her, she swears to protect her to the death, and she will never let him suffer any more grievances!

When the waste material turns over, when the sick king no longer hides his strength, their love is destined to be vigorous, so that the world can only look up!

But when the world said that Princess Xuan was arrogant and ruthless, and her wrist was bloody, he said: “My love is the biggest capital of your arrogance and domineering!”

- Description from novelbuddy

Bags of salt, spices and sugar stacked from inside the shop all the way out into the streets. Merchants loaded with goods going flooded the streets with their carriages.

Battle of Mount Hyjal:

The overwhelming Burning Legion, Malfurion on the front line saw his death as his own.

Outside the barracks at the rear, Li De leisurely started his singing.

A spectacle composed of countless terracotta figurines rises from the ground!

“Building Wonders: Terracotta Warriors.

Spectacular effect: All combat units are upgraded by one level! ”

“This…is this the power of a demigod?”

Malfurion clenched his fists and asked in disbelief.

“You’ve become stronger, send it quickly!”

Li De said, but what he thought in his mind was:

“What’s the best way to build the next spectacle?”

This is a story of a traveler with a spectacle system, farming in the world of Azeroth, and blooming the light of civilization.

- Description from novelbuddy