Douluo Dalu 2: The True God King - Chapter 55: [DD2]:

Forced to face how vast and dangerous the universe really is, Desmond decides to seize the opportunity to gain the power he needs to protect what he loves, for his own world is far from safe. Traveling through various worlds, Desmond gathers treasures and powers, gradually discovering the dark secrets that lie behind the false tranquility.

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Nikola Tesla, the genius, a man who lost everything to balant capitalism and betrayal, awakens to find himself reborn as an orphan. What is this world? Why is he here? And will he once again fall for the capitalistic betrayal or pave his own way? What would happen if his genius adapts to cunningness of the society?

Li Yuan was struggling at the bottom of society, however out of the blue a peach pit appeared. He did not know that at that moment, the peach pit will completely transform his life.

With this peach pit, Li Yuan not only strengthened his body, but also changed normal crops to rare highest quality items.

Henceforth Li Yuan started to manage a farm, established a ranch and bought a fishing ground. Not only did he become the number one crop supplier, but also possessed a land to govern, making him a genuine landlord.

He had leisure time to enjoy beautiful landscapes, pleasantly touring the mysterious world, tasting top-notch culinary cuisine, effortlessly chatting with females, this beautiful life is no longer a dream!

- 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.