Naruto: I Can Take People Through the Ninja World in the Future - Chapter 42: The First Rinnegan Test, Am I Actually Magneto?

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.

Bai Li, an Agricultural Deity from the immortal world, traveled to the Interstellar era where land is scarce and his farming soul is burning. In a world full of were-people who can turn into many different types of animals, he is a rare human who does not have an animal form.

He entered the ‘Virtual Reality Game Design Competition’ and created the farming game ‘Carefree Farmstead’, leading Interstellar people to farm and explore in the game so that they can gradually understand the charm of farming. The game would lead Interstellar People to grow and explore in the game, and let them gradually realize the charm of farming. Farming, food, infrastructure, life ….

Inadvertently, the interstellar people’s real life takes on a new twist.

- Description from Novelupdates

In a world where everyone changes jobs, I actually awakened to a unique dual career.

And a life-defying career?

High-quality items to cherish? I synthesize directly.

Cherish high-quality skills? I synthesize directly.

Senior pet cherish? I continue to synthesize, wait, how did this beast girl become so big after synthesis?

Let’s start with the synthesis of three skeleton summoning books…

Synthesis – [Undead Army]

Three more dark staffs to synthesize…

Synthesis – [Death Scepter]

The game competition of billions of races in the universe, our solar system, can we earthlings stand on a broader stage!

…

- Description from novelbuddy