Starting as a Mechanical Hunter - Chapter 420 - 169: Maniacal Laughter of the Celestial Calamity_2

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.

Lin Ping'an traversed to a High Martial World, where the Ten Thousand Races invaded, leaving the Human Race weak and on the brink of danger. At this critical moment, he awakened the Civilization Master System.He simply created countless speedy Demonic Cultivation Techniques that spread widely, causing the Ten Thousand Races to exclaim how truly bizarre they are.[ Painful Demon Body ]: The longer the cultivation time, the faster the Qi Blood grows, but the more painful it becomes.[ Qianyuan Burning Life Technique ]: Burns life to gain strength, living like a summer flower, blooming with momentary brilliance.[ Celestial Demon Dissolving Technique ]: Burn all of oneself to unleash the strongest combat power.[ Abi Dao Three Blades ]: Bound by Demon Thought, eternally falling into Abi, the three blades extinguish ghosts and gods.[ Heaven-Defying Seven Demon Slash ]: Soul destroyed with no regrets, protecting the Human Race, slash slash slash slash slash slash slash.[ Life-Burning God-Slaying Arrow ]: Soul as the guide, life as the arrow, one strike for the fall of the demon emperor.Emotionless Swordsmanship... Dao Heart Demon Planting Technique... Blood God Technique... Sunflower Manual... Blood Escape Technique... Soul Destruction Nine Palms...

Si Shuo didn't get a compatible heart in time, but instead received the More Children, More Blessings System and was sent to the Beast World Continent.She is a mutated, blue-eyed, white-furred female Cat Beast with a congenital hearing impairment. Her fertility was even stripped away by her Mother and given to her older sister. She is now facing the crisis of not finding a mate and being sent to the female cave!System: Congratulations, Host, for obtaining a special-grade fertile constitution that surpasses even a Female Saint... Congratulations, Host, for obtaining the life-infused Wood Element Ability... Congratulations, Host, for obtaining a shared growth space... Congratulations, Host, for obtaining the Nine Lives Cat destiny, which can be inherited by your offspring.From then on, she began living a cozy life with a husband, children, and a warm home...