Male Lead's Canon Fodder Wife - Chapter 1536: A Place In Her Heart

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

- 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.

Ten years of marriage.Known since childhood.Yet, he felt he had never known her.What he saw was a loving and gentle wife. But what he heard about her from others had always been different.One said she married him for his money.One said she seduced a Prince behind his back.One said she spiked her sister and sent her to a man’s bed.One said she tortured the servants behind his back.One said…He had heard many such things but never believed anyone.Until one day, he saw how she scolded his brother, slapped his sister-in-law in the face, and pushed his nephew into the pool.He couldn’t take it anymore and asked for a divorce but she rejected to his face.Then he heard the news that she obtained the shares of their company and was about to overturn his brother’s position.“How did she turn into a scheming wife?” he asked, not really expecting any answers.But he got a chance. He woke up to the day he got married.He thought it was his chance to get rid of the woman from his life. He would save his brother and his family from his ‘wife’. He will get a divorce from her.But…Why couldn’t he get rid of this wife at all?Had she been so scheming all her life? Clearly not.In this life, he started seeing her life the way he had not seen before. From her perspective, she had shed tears without him knowing.He realized that he had been a bad husband all along.Suddenly his life changed from trying to divorce her to changing her ‘fate’.Who would win in this battle?Her fate of becoming a scheming woman? Or his determination and … love?

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates