The Main Characters That Only I Know - Chapter 343:

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.

Three years ago, the animals and plants on Earth underwent crazy and unexplainable changes that included transformations, reversions, and the addition of otherworldly species. And it was the start of a brand-new type of profession in the new generation of humanity – Monster Trainers, people who specialized in taming monsters.

Not to fall into the cycle of reincarnation within the vast world,The heart transmits the Dao among humans.Willing to wield a sword to end myriad calamities,Exchange ruthlessness for a world of emotions!

“How can it be!”

Tang San looked at the unscathed Lu Yuan in shock, and subconsciously said what was in his heart.

“Nothing is impossible.”

Lu Yuan stood there calmly.

If a spatial ability user can’t dodge the most basic physical attack on the spot, he might as well dig a hole and bury himself.

- Description from novelbuddy