MTL - Martial Dao of Longevity: I Use Qi and Blood To Add Points Infinitely - Chapter 113 Shocking hundreds of domains and 300,000 states, a hundred domains wanted orders (millions of

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.

Meng Qianqian, at the age of 15, married into the Lu Family to bring joy to the elderly matriarch.On the wedding night, urgent news arrived from the border that her husband had been commanded to go to war. Six months later, he tragically died at the hands of Beiliang soldiers.Five years later, the husband who had been presumed dead returned, and by his side was an ethereal mute woman named Wan'er.Lu Lingxiao said that Wan'er was the descendant of a loyal and righteous family, entirely different from her—a merchant girl reeking of copper coins. He claimed Wan'er was a true paragon of noble character.Lu Lingxiao also said that Wan'er was an eagle soaring in the heavens, while someone like her was nothing more than a fragile flower, unworthy of comparison.It was not until the land was broken, the city walls fell, and she wielded a Red Tassel Spear to crush countless soldiers that Lu Lingxiao realized he had misjudged her.She was not a delicate flower confined within the depths of the mansion; she was the fiercest west wind of Yumen Pass.

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.

Wang Yi was reborn into a world that swallowed the starry sky. After eighteen years of ordinary and extraordinary, he finally met the conditions on the eve of graduation from high school, activated his own golden finger, and signed in for the first time.

[Ding, congratulations to the host for successfully signing in, signing in for the first time, and signing in to the earth, special rewards will be given to reward the first karma of the Nine Tribulations Secret Code! 】

[Your genetic level has increased three times! 】

“…”

- Description from novelbuddy