Reborn in the 80s: She Rewrites Life with Radiance - Chapter 108 Standard Bearer

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.

What would happen if someday, someone gave humans the opportunity to have the power of the legends?Total Chaos!That's the answer to that, people started killing, r*ping, extorting and torturing, to become the strongest.In such a world, a nerd like Eric became one of the strongest.With the resolve of a better life for his family, his loved ones, he managed to flip his destiny around, and become the strongest, and built his Empire.He went so far, that he was close to ascending to the Immortal World, that world of dreams.His story looks like one of a fairytale, but a fairytale it's not.Just as he was about to ascend, he was betrayed and killed, by his closest friends, and his half-brother.At the death's door, he learned about his brother's atrocities, but his time had finished.If only he had another chance!If only he could have another shot at life!He would definitely live differently!But could he!?At that moment his soul was transferred into a black space!

Desperate to overcome her loner status, a forlorn female student was on her way to a welcome party held for newcomers at her college. Stepping on a banana peel and falling over she passes away. For some reason or another, she is reincarnated into the strongest dragon species…

“…. I really wanted to make friends, but now there is no point!!!”

Despite her complaints, this is the story of a Dragon who rouses herself in order to make friends.

In the early world of immortal cultivation, there was no physical cultivation among immortal cultivators. And a top bodybuilder who came from the earth has opened up a new path here and became the ancestor of physical training.

- Description from novelbuddy