MTL - Iron Powder and Spellcasters - Chapter 1 sequence

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.

A top hacker was chosen by the Lord God to be reborn into countless worlds, always as an expendable villain.

With no free will, every world became a dead end. Every one of his lives ended tragically.

Finally, after wrestling control of the Villain System, this ace hacker decided to enact revenge. Even if his very bones were rotten, he’d choose to occupy the very heights of morality, if only on the surface.

Thus, he would change his fate as an abused slag.

Cheng Ling, the descendant of modern martial arts, traveled to the ancient times of war, and took his family to escape from the famine, farming, practicing medicine, and doing business…

Working hard for tomorrow, only to get a place to live in this strange era after the world is stable, to stand up with dignity, instead of kneeling and begging for life.

But who knew that disguising as a man was so successful that the new dynasty left her good name everywhere.

Young Master Hou’s Mansion: Young Master Cheng is very talented, and what he said casually was the rule of the world. I must recommend him to the prince.

Guozijian sacrifice wine: Cheng Xiaoyou has a splendid beauty in his chest, and the day when the imperial examination resumes, it must be the time when he will become famous. If he can’t win the top spot, the old man will slam into a pillar to tell the sky.

Miss Xiangfu: Cheng Shenyi is a prodigy, but he has a noble character and is not interested in fame and fortune. I respect him and love him, even if I have no relationship with him, I should ask the prince’s cousin to give him a birth.

Ten Miles of Spring Breeze Hua Kui Lady: Except for the three feet of snow on your body, who in the world is matched with white clothes? In that court, were they okay with you?

With a sigh, only remote mail.

…

And the prince, who was always mentioned in passing, intentionally or unintentionally, had already quietly raised his chin.

Prince: My brother, my confidant, what do you say?

Cheng Ling:  …

- Description from novelbuddy

It is an era of artificial superintelligences, interstellar travel, gene medicine, and virtual reality worlds. Far into Earth’s future, 15-year-old Gu Ding is a student of Cerulean Military Academy by day, and tavern waiter by night. His ambition: Become the space pirate with the highest bounty offered by the Universal Federation Government. With the help of Neptune, a neonate super-intelligence, Gu Ding finds himself thrust into a galaxy of shadowy organizations, political underdealings, and otherworldly forces that lie beyond human comprehension…