MTL - Dragon-Marked War God - v2 Chapter 5208 scale new heights

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.

She is the legend of the Heavenly Soul Alliance, the king of mercenaries with a perverse personality, the world’s number one head reward, she closed her eyes unwillingly in a conspiracy, but opened her eyes in the mountain of corpses in another world, when he met her , he knew at a glance that she was the love disaster of his life, he was unwilling to resolve it, and held her in the palm of his hand, and accidentally spoiled her to the sky, shocking the three worlds.

“Your Majesty, it’s too bad. Your Majesty led tens of thousands of soldiers to level the Shuize Empire and smashed the dragon’s Nilin one by one!”

Without raising his head, a certain person said two words softly, “Follow her!”

“Your Majesty, it’s not good again. The empress is too handsome in a golden armored uniform, and she was thrown down by the goddess of Luoshui as a man!”

A certain person with a face full of black lines, gritted his teeth, flew out, grabbed the goddess and threw it back, half-fading the golden armor, hugged the lazy and handsome boy tightly in his arms, and said with a gloomy face, “See clearly before rushing, She’s a woman!”

The Goddess spoke weakly, “I don’t mind her gender, I love her for who she is!”

Someone was murderous, “I don’t mind, she is my woman!”

- Description from novelbuddy

Pendulum clocks replaced sand glasses; the world’s first pocket watch ticked through its 100th year. Steam power welcomed the advent of machinery; industries took over farmlands. The study of Science brought humankind out of the clutches of superstitions and pushed them to a path of endless possibilities. And one man witnessed it all.

He was a moth among mayflies, fluttering through as generations replaced generations- fuelled by an endless thirst for knowledge. But fate decided to introduce him to a butterfly- someone alike, yet so different.

Follow ‘The Actor’ Xavier Godwin and ‘The Seeress’ Yue Lin as they delve into the world hidden from the common eyes- a world of magic and mysticism- as they evade the sights of countless hidden organisations, and create a secret society of their own.

To save a doomed fantasy world, I killed the main characters, then destroyed the game world, and fell into another timeline as the academy's top seat and rival to the protagonist.Now, I'm trying to save the world and steer it towards a better ending…But I'm the final boss.