Reborn: Rise of the Greatest Summoner - Chapter 62 Predator’s Genius

The world experienced a cataclysmic change, and countless spatial gateways appeared out of thin air.

Although it was only a marriage of convenience, Amelie Ashford was the perfect wife in every aspect. She was intelligent, obedient, and well-respected. She was kind to everyone and devoted to her husband. And she was perfectly content to spend the rest of her life like that, even though she was constantly nagged about getting pregnant. That was until her husband entered their house with a mistress by his side and eventually demanded a divorce.“Very well,” Amelie said calmly, “I will divorce you.”Richard's eyes shone as he heard his wife utter these words. However, to his surprise, she was not done. “But don't be surprised when you get an invitation to my next wedding.”To everyone's shock, Amelie indeed got married again, and to a younger and, as it turned out, richer man!And she made sure that her ex-husband realized what it meant to lose the support of a woman like her._____

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.

The eldest daughter of the Yan family, Yan Jinyu, who has been missing for 16 years, has been found. She is brought back from an orphanage by her fiancé, the Second Master of the Yin family.