One Piece: Dream of Immortality - Chapter 14: Catalogue

Going against the heavens, Tuoba Ye reincarnated. Body concealing Divine Root, hands holding Divine Talisman, possessing previous life’s experiences, from childhood, began cultivating the most difficult body refining method: Mythical Nine Transformations.

- Description from Novelupdates

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.

Time Sin is distinct, Numerical Sin is crafty, and Fate Sin is undefinable; when Sinners become calamities, all living things suffer!......Wondering about the population dividend in the Cultivation World?This book will tell you the answer!......Wang Zijia has transmigrated, obtaining the Golden Finger at the same time, which allows him to exchange his own body at will.But when he discovers what he can exchange with it, he is utterly speechless.Weights: Collection of Miscellaneous Literary WorksValue: 6Description: A treasure trove of knowledge for an adolescent, cultivated intensively for over a decade; it's a precious gem from a Foreign World with immense value!Wang Zijia: “... ...”Looking at one of the biggest Weights, Wang Zijia is momentarily speechless. Reading novels is actually one of his most substantial life experiences!......As he uses the Golden Finger to rewrite his futile life, he unwittingly forces his Spiritual Roots to produce an offspring, making the world start to seem different.All kinds of audacious schemes began to surface. Exploiting junior brothers, deceiving baby demonic beings, convincing the worthless ones that they are geniuses. Constructing his own channels and factions, inching his way towards survival on the road of immortality!