SSS Rank Sword Mage: Awakening Starts with Weakest Mana Affinity - Chapter 36: King or a Pharaoh

The journey to the martial peak is a lonely, solitary and long one. In the face of adversity, you must survive and remain unyielding. Only then can you break through and continue on your journey to become the strongest. High Heaven Pavilion tests its disciples in the harshest ways to prepare them for this journey. One day the lowly sweeper Kai Yang managed to obtain a black book, setting him on the road to the peak of the martials world.

- Description from novelupdates

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.

In a world besieged by monsters, humanity's survival hangs in the balance. But hope emerges when every individual comes of age, bestowed with the chance to forge a bond with a hero. These bonds grant them formidable powers to combat the relentless threats lurking in the shadows.Enter Chen Ye, a newcomer to this tumultuous realm. Amidst a sea of aspirants, he discovers an unexpected trend: everyone gravitates towards heroes from the legendary series “One Punch Man.” While most covet the esteemed S-tier champions, Chen Ye discerns a truth hidden to others. He recognizes the unparalleled strength of the One Punch Man, a humble C-tier hero.Undeterred by societal norms and peer pressure, Chen Ye boldly selects the Saitama Physique as his ally during the pivotal graduation ceremony. However, his decision incites scorn and derision, broadcasted live for the world to witness.Mocked as a fool for his unconventional choice, Chen Ye retreats into a realm of silence, channeling his energy into rigorous training. Three arduous years pass, marked by relentless dedication and unwavering resolve.Then, as if scripted by fate, a transformation unfolds. The once-dismissed Chen Ye emerges not as a punchline but as an enigma—an indomitable force. Clad in the invincible guise of the Saitama Physique, he defies the very fabric of reality, rewriting the rules of engagement and carving his legend in the annals of history.

Caden Ryder.Having both the status of a Transmigrator and a regressor.Once a human from Earth and a ruthless domineering general of the Purple Continent.His journey through the mystical world was rough and filled with betrayals.Following the death of Emperor Rozen Riverrun and the rise of Emperor Zeraith Riverrun.Both eras brought about the rise of the Redmen Race.And the death of the Purplemen Race, in the end....After years of fighting, after years of defending the Purple Continent.It was all for nothing. But little did he know that his execution was the beginning of his journey.[Regression Alert!]Regressing back to the time when Kyle Freeman transmigrated into the body of Caden Ryder.Now amped with the knowledge of two past lives, with his determination to grow stronger.With the zeal to live the mundane and quiet luxurious life he has always dreamed of.Caden must walk the path of domination, the path of conquerors.Armed with a Primordial System. Armed with three SSS-Ranked Ultimate Skills.If he must conquer the Red Continent to live his mundane, quiet, and luxurious life.Then so be it, he shall conquer the Red Continent.With the knowledge of his past lives, walking on a path of mysteries and adventures.If there's no way. he will create a way