MTL - God Level Cultivation System - Chapter 1 Crossing with the system

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

Pet shop owner Tang Wan was accidentally reborn into an interstellar world. When he opened his eyes, he found himself automatically married to a vegetable via the StarNetwork. A social status worth ten billion yuan; but with an unconscious husband, he was unable to withdraw any money. Tang Wan held the empty position of the First Gentleman, but was, in fact, a poor man.

In order to secure his future livelihood, Tang Wan was bound to the “Earth Pet System” and returned to his old business, with the goal of saving money, getting a divorce, and looking for a second spring!

After thousands of years of evolution, Earth’s energy depletion had long been abandoned to the distant corners of the Milky Way. All of the animals in the galaxy had evolved tremendously, and little furry cute ones only lived in textbooks. When Tang Wan and his cute little ones appeared, they became the treasures of the whole universe! The pet shop soon became famous in the interstellar world, and the whole universe lined up to be cat slaves~

Finally surviving past the compulsory marriage period, Tang Wan happily took off the diamond ring worth billions: he can finally sell it for money!

However, Tang Wan could never have imagined that when he sat down at the dining table on a blind date with some fresh meat, the vegetative partner that he had come to an agreement with would suddenly open his eyes.

Gong: I heard you sold your wedding ring for one billion yuan?

Tang Wan reached out and pushed him down on the bed: Open what eyes, quickly close them.

- 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.

The free-spirited and brutally honest Ye Zhen Zhen was unwillingly chosen as Empress to the playboy Emperor Ji Wu Jiu. Their very first wedding night, she kicked the Emperor down from their bed and he sought out his concubine instead. This completely disastrous start was only the beginning of their eventful life together.