After Giving Birth, All My Beast Ex-Husbands Suddenly Want Me Back - Chapter 3: Worthless cripple

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.

Living life in this new world was already hard enough....So why?Why is the villainess of this world obsessed with me?

“The new book 'Scolded as the Star of Death, All the Big Shots in the Capital Rush to Spoil Me' is now available!”Also known as “Reborn Era: Getting Rich with the Check-In System.”[A physical powerhouse of a female lead vs. a vindictive, sarcastic, and elegant male protagonist]After a laboratory explosion, Lin Tang returns to that impoverished era and is bound to a check-in system.Before she has time to claim the newcomer gift pack, her fiancé, sporting an air of confidence, comes to break off the betrothal.The reason being, he's about to secure a stable job.Lin Tang looks at the ordinary yet self-assured man, parted her red lips slightly and said, “...break it off!”Less than a month later, her ex-fiancé was fired for some reason.Lin Tang took a stroll around the county and became the executive officer of the Broadcasting Station in the Textile Factory.Ex-fiancé's internal OS: Is it too late to reconcile now?Those times were tough!Despite being treasured by her three big brothers and parents, everything from food to cloth and even soap required coupons...Even living frugally couldn't alleviate the miserable condition.Looking at the black mush in the bowl, Lin Tang fell silent, “......”Thankfully, she had a system!Need anything? Just check in to get it.Many years later.A handsome man looked at his delicate wife with a fair complexion, managing to keep a straight face as he said, “I heard you could knock out a wild boar with just two punches?”Lin Tang's eyes sparkled, her fingers gently exerting force, and the Enamel Jar in her hand deformed. She responded in a stern manner, “Nonsense! Don't believe those rumors. We're civilized people and can't be that barbaric!”

The sky thunders, Fang Yue, the nail household, dies on the street, the heavenly court blackmails, obtains compensation, reincarnates, and sees how Fang Da Devil disturbs the universe and upset the world.

- Description from MTL