Harry Potter and the Fortunate Queen - Chapter 7: A Howler

Earth, thousands of years after the apocalypse.

Countless technologies and advances had been lost to time as the Specters, horrifying beings with terrifying powers, arrived and destroyed the world.

Over the coming thousands of years, humanity had built itself up but always died again.

Nobody remembers the past.

Nobody remembers what humanity had once accomplished.

Now, everyone is living in a world where the Specters reign supreme.

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A boy with amnesia woke up in the middle of the Dregs, the worst part of Crimson Fungus City.

The boy grows up and manages to become strong enough to pass an exam for one of the most prestigious jobs in existence, a Zephyx Extractor, someone that can harvest the powers of Specters.

Sadly, he had already gained a power from a Specter in the past, which made him ineligible for the position.

But then, a mysterious man visits him.

And his luck finally turns around.

……………………………………………………………

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In the City of Crime, one law stands above them all: Only the strongest can live.

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.

Freshman student Yang Dingtian possesses the Nine Yang Body, found only 1 in million. His Yang Fire is incomparably vigorous and thus, he cannot be near a female’s charms for his entire life. On the night of his 19th birthday, he decided to bid farewell to his virgin life. After stealing and tasting the forbidden fruit, he spontaneously combusted as the result!

In death he crossed over to another world; a world that held respect for Martial Power. His, originally, catastrophic Nine Yang Body was the Nine Yang Body that couldn’t be seen in a millennium! He was saved by a mysterious old man when he was at his last moments and the old man received him for a disciple, then betrothed his daughter to him. Thus, in this odd way, Yang Dingtian became the successor of the largest clan under Heaven, and became the number-one-beauty-under-heaven’s fiance.

- Description from Novelupdates