The Young Matriarch - Chapter 492 - Lets Exchange Contact Information

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.

A modern Japanese man reincarnated into a game as Welner von Zeavert. Though he reincarnated as a noble’s son, he is neither the main character nor the hero of this world. He become someone who didn’t even appear in the game.Plus, with only [Spearmanship] as his skill, he can’t even join the hero party to clear main story.His small advantages are the fact that he became the hero’s friend and his father’s rather high status. He’s nothing but a supporting character of the story.He noted the game story that he knew from his past life, used it, along with his authority and influence as a noble, to survive from demon king army.But, without realizing it, the knowledge from his past life and his memories of the game story affected the world. He saved people that should have died and took care of events that didn’t appear in the game.With that, he carved history of this worldThis is not a story about the hero. This is a story about struggle and effort of a young noble.

“Where do you think you are going with those bags?” Xander interrogated as soon as he cornered her.“Of course, I’m leaving you!” She said, standing her ground, despite the fear in her eyes.“Why?”“You forgot to mention how dangerous you were.”Xander let out a deep throaty chuckle. “Sweetheart, you didn’t ask.”“I don’t care! I don’t want to be a part of this anymore!” She insisted.Xander shook his head. “Too late. We are already married. You now belong to me, and divorce is out of the question.”—Aurora Swift’s world shatters when Owen—her boyfriend of five years—breaks up with her via text. The betrayal deepens when she finds out he’s also getting engaged to her half-sister, Olivia Swift on the same day.Heartbroken and filled with rage, Aurora has a one-night stand with Xander Scott, Owen’s enigmatic uncle and the youngest billionaire in the country. When the fling leads to a marriage proposal from Xander with a promise to help her get her revenge, Aurora finds it hard to refuse.However, Aurora soon realizes that this is anything but a whirlwind romance.Xander Scott hides more secrets than Aurora knows, and the dangers that follow his mysterious identity soon bring about complications in their marriage.When Xander’s secret identity comes to light, will Aurora choose to remain in the marriage as her love for him has grown in depth, or let it drive them apart?