Iron Blooded - (B2) One: Across the Plains

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.

Thiago has nothing—no money, no connections, not even shoes.Just raw talent, a dream, and a strange System only he can see.From the streets of Rio to the world stage, this is the story of a boy who plays to survive—and fights to rise.

In the Immortal Realm, where Immortals roam here and there, and the strength is supreme, there is a kind of existence who are favored by the Heavens.

These existences has their luck attribute boosted by thousands, and are collectively called as the Children of Luck or Son/Daughter of Luck.

Among these, Yu Tian was born with negative luck attributes and was destined to die under those so-called Children of Luck.

However, with the help of the Villain System and the powerful Yu family behind him, he will rewrite his destiny and crush those Sons of Luck and cultivate those Daughter of Luck.

At the beginning, he forced the family of the Daughter of Luck to send her to his bed personally.

Takebayashi Ryouma, a 39 years old man with hidden past, found himself in a strange white room. The gods tell him that he has died and that they are sending his soul to a different world, a world where magic exists. After living alone for 3 years, his gamer soul loses its common sense and starts along crazy routes.