Da Xuan Martial Saint - Chapter 128 - 120: The Demon Snake

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.

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!

The celestial celestial beings who lived for more than 100,000 years were born and reborn in a small monk in a human world.
His motto: “It’s not as good as a medicinal medicine for ten years of hard work.” “Even if you practice a copper-iron bone, it’s not enough for my soldier’s attack.”

- Description from Novelupdates

(Rebirth + Business warfare + Pampering spouse + Dog food)Investing today? I've got more important things to handle.Financial crisis? Not my problem; anyhow, I won't be losing money.Huh? This stone of yours is pretty nice, wait for a call at home!Xiao Ming closed the door, turned around, and took out a fist-sized diamond: “Honey, let's grind this into a ball for the kids to play with!”