I, The Female Protagonist With Superpower, Am Super Fierce - Chapter 3186 - 3186 Chapter 3186 you are my favorite

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.

This stands at the forefront of strategy guides to Life (a shitty video game)!

There was a time where I was summoned to a different world. I spent more than a year as a Priestess from a different world. I fulfilled my role and decided to return to my original world. Before leaving, I confessed my feelings to my escort knight. And from there I was heartbroken. After returning to the original world for a year and half, I was summoned again. What? Apparently this time, nobody summoned me. I was sent out to a great extent and have a lost love. I cannot face anyone now! No one knows that I was a former Priestess and I can only quickly return to my original world. Even so, it does not seem to work out very well…

Hurt. Bullied. Ignored. Boris decided to end his life in the most pathetic, cowardly way imaginable.But of course—how could even death go right for him?Fate, it seems, had other plans.Boris wakes up in another world, reborn as Kaden Warborn—the second young master of the Warborn family. A clan of glorious madmen who treat death like a family tradition.And wouldn’t you know it—death comes knocking again.[Congratulations, Host. You have awakened the Cycle of Rebirth System.][Core Principle: Die to grow stronger.][So go on, Host. Don’t be shy.][Court death.]…Excuse me?Armed with a system that rewards dying, surrounded by maniacs who treat funerals like festivals, Kaden Warborn begins his new life.Hopefully, this time, not like a coward.