The Supreme Level Up System - Chapter 137 Lost Prey

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.

“Finally,” he thought, stepping through the spatial membrane, into the vast and dangerous `Primordial Dimension` where life and death are infinitely close to each other.Dying unexpectedly, Shane found himself in the body of a newborn baby, within a strange, foreign world.The foreign world, inhabited all kinds of terrifying beasts which escaped from the Primordial Dimensions in order to create havoc on it.Even though humanity was on the brink of extinction, the Primordial Dimensions provided an unimaginable opportunity to reach higher realms, while imminently threatening them with the possibility to be conquered by foreign races.But who would have thought that the destructive and cruel Primordial Dimension where monstrous existences emerged from, would one day become humanity´s ray of hope?Becoming stronger and wielding elements by absorbing mana was not a dream anymore, only to notice, that everything was not as simple, as they initially thought...Follow Shane Suro on his journey through the vast Primordial Dimensions where he learns about freedom, friendship, cruelty, loyalty, and betrayal.

Suo Fei, a veteran NEET has spent three-days and three nights strategizing his way through the highly explicit H danmei game masterpiece “Yalance”. Furthermore, he was able to capture all nine little shous from the nine great races. However, as the final, 10P feast was approaching, he unexpectedly transmigrated. He transmigrated into the real country of Yalance…

Suo Fei: Hey, hey, hey, can you delete these files and let me restart? What the hell did Laozi transmigrate into!

- Description from Novelupdates

Abandoned at birth in a humble stable, Shirone was raised by commoners—but he was anything but ordinary. Blessed with remarkable insight, he taught himself to read at a young age. A fateful visit to the city introduced him to the wonders of magic, igniting an unshakable dream of becoming a mage. Yet, beneath the city's dazzling facade lurked a ruthless social hierarchy, where power and privilege crushed those who dared to rise above their station. As Shirone uncovers the world's darkest secrets before even coming of age, one question remains—can he defy fate and claim his destiny as a mage in a world determined to keep him down?