Itai no wa Iya nanode Bōgyo-Ryoku ni Kyokufuri Shitai to Omoimasu - Chapter 320

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.

In his last life, Xue Yan had been a powerful minister all his life. When he returned to seven years old, he didn’t want to be any more. In the same way, he has all the power in the world, but his family cannot end well.

Unexpectedly, his father suddenly picked up a baby girl, saying that he had raised him and would be his daughter-in-law.

The daughter-in-law is all good, but not good at all. She can’t be allowed to sneak out alone.

Otherwise, she will bring you back a great general this time, and next time she will bring you a different surnamed king, and even the queen mother of the dynasty will be rescued…

Not long after, I’ll bring you a little emperor again…

*

Jiang Yue, the supreme commander of Area A in the end of the world, actually dressed in ancient times and became a three-and-a-half-year-old girl.

No matter how she lived her life, it was just that her future husband didn’t know what was going on. Every time she kindly rescued a person, he would be disgraced.

(Sweet pet text, one-on-one, double clean)

- Description from novelbuddy

A human warrior cultivating the Ancient Strengthening Technique has transcended dimensions and arrived on Kyushu. Together with twelve ravishing beauties with looks that were unmatched in their generation, will he be able to stand on the summit of this world?

At the moment when he was about to be buried alive by the villagers, he blew himself up… no, he saved himself successfully.

He just wants to live and die in this era, but… that woman is too crazy.

…

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- Description from novelbuddy