Mrs. and Mr. Smith - Chapter 2224 - 2222 Man with the Mustache Appears

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.

Qin Zhaoyue, a hundred-year-old Soul cultivator and famous artifact refiner, dies and transmigrates into a body of 16-year-old Xi Zhaoyue, who was killed on her wedding day.

The unlucky previous owner of the body was an illegitimate daughter of an influential family and was forced to live her whole life in the orphanage. However, at the age of 16, her Guide glands were awakened and as fate willed it, Xi Zhaoyue happened to have the highest compatibility with the youngest, bravest, most handsome Major General of the Empire, a dream husband of the whole Outer Space! Finally, a loving family she so longed for was within her reach… Yet, at the wedding ceremony, her Mental sea was invaded and she died.

Once Zhaoyue figured out the situation she landed herself in, she vowed: she wouldn’t be a proud and self-respecting cultivator, if she didn’t strive for independence, for the right to live the life freely! Cultivate, refine, get stronger! Become your own person!

- Description from Novelupdates

Lin Lan transmigrated into a book set in the 80s and became a young widow with a child.As soon as she opened her eyes, someone was at her door demanding payment of debts, and when she went out, she was met with the disdainful and contemptuous gazes of her neighbors!She, a person who had owned a house and a shop through her own efforts, would she fail in the 80s?Facing external threats and internal difficulties, she picked up the skills from her past life, selling spiced broad beans and pea cakes outside, opening a shop...Her sister-in-law said, “Lin Lan, that man is not bad. He's strong and very family-oriented.”“No time, I'm busy with my business.”Her maternal aunt said, “You're just a widow, what are you being picky for? He's a 'ten-thousand-yuan household,' he doesn't mind that you have a child, you should be content!”A ten-thousand-yuan household! Heh heh!A certain man watched the busybody matchmakers who came to introduce partners to Lin Lan, his eyes gleaming with a cold light, as he strove to pursue his wife!

Enter a world of superhuman abilities and mysterious organizations as you follow the story of Jiang Bei, the enigmatic founder of the Infinite Alliance.With the power to extinguish stars and melt anything in his path, he is hailed as a god among men and the torch of the Dark Era.But what secrets lie behind his incredible powers, and what will he do to protect his legacy and extend his life?