MTL - Twenty Seven Years - Chapter 323 not that bad

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 female protagonist transmigrated into a wretched, lazy, and gluttonous villainess in a farming family!Her notorious reputation, fostered by her overly pampering mother, alienated the entire family. See how Jinhua cleanses her name, becoming diligent, brave, and the applauded golden girl everyone praises.With a wretched mother, a sick father, a stepsister, four brothers, and a bunch of nephews, all dead broke and needing support, poor and infighting, what to do?No worries, with the System in hand, I have the world!Harmonize the family, build wealth and prosper.The belle of the villages for miles around, Jinhua the beauty!……Mountain man, what was it you said before? You'd rather die than marry her, and even one more glance would shorten your life?A certain mountain man: No, no, no, wife, you must have heard wrong! I said I'd rather die than not take another glance, and I'd shorten my lifespan just to marry you.Hmph, that's more like it!!

After the battle, the beautiful senior sister shyly raised her face in front of you and slowly closed her eyes. At this time, you…

Eh? The choice this time was too simple. Of course, it was four.

It is an era of artificial superintelligences, interstellar travel, gene medicine, and virtual reality worlds. Far into Earth’s future, 15-year-old Gu Ding is a student of Cerulean Military Academy by day, and tavern waiter by night. His ambition: Become the space pirate with the highest bounty offered by the Universal Federation Government. With the help of Neptune, a neonate super-intelligence, Gu Ding finds himself thrust into a galaxy of shadowy organizations, political underdealings, and otherworldly forces that lie beyond human comprehension…