The Abyssal Garden: No Room for the Idle - Chapter 14 - I said we should have a good chat

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.

Chained by slavery and yet craving freedom, such is the fate of Alpheo , a modern historian forced to live under the grip of slavery in a land where chaos would soon erupt.

As the empire of Rolmia plunges into civil war following the death of the emperor , his three ambitious sons vie for the throne. In the midst of this turmoil, Alpheo finds the chance to break his chain and escape, leading his companions into the ashes of war, trying to thrive in it, selling their swords to the highest bidder .

But beyond the borders of Rolmia, hungry eyes watch as the empire's grip loosens. The Sultanate of Azania, ever the opportunist, sees a chance to expand its domain and influence , while to the south, neighboring principalities breathe a sigh of relief as the once-dominant giant stumbles and falters.

In the north, the confederation of the Free Isle finds their chance to restore their old tradition of pillaging and piratery, denied to them by an empire that is now crumbling beneath itself.

In this crucible of conflict, where dynasties crumble and empires fall, Alpheo find his call and the chance to forge his own destiny amidst the ashes of empires.

……………………………………………………………

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A story of Gin, a young man who lost his memories before the age of 17 and became a magician. Living a quiet life running a cafe while researching magic, he is suddenly thrust into an unknown world. Moving between Earth and a realm filled with danger and secrets, Gin must rely on his knowledge, skills, and magical prowess to navigate the perils that arise. Ruthless and determined, he will stop at nothing to uncover the truth behind his lost memories and the mysteries of the world, using every tool at his disposal to rise above all