Extra's Path: The Eternal Frost Monarch - Chapter 8: Training (1)

Sangyan turned into a widow known to bring misfortune to her husband. Despised by her in-laws and disdained by her own family, she volunteered to retire to a remote estate to live out her days. At this moment, she caught the eye of a tyrannical emperor with a strange illness - being near a woman caused him unbearable itching and relentless vomiting.Hence, the 26-year-old emperor had never favored any of his consorts, let alone sired any heirs. The imperial harem constantly pressured him for offspring. The common people also yearned for a royal heir. When they learned that the tyrant held affection for Sangyan, the widow with the ill-fated destiny, the entire nation opposed their union.Eventually, the entire country pleaded with Sangyan to bear children for the sickly and tyrannical emperor...Beauty widow with a deadly fate VS Emperor with allergy to women

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.

[Cultivation+SoL+Harem+Clan]Lin Xuan Qi transmigrated to Da Qian, a world of cultivators and demonic beasts.All he had was the Clan Prosperity System.At first, it granted him a mansion and rewarded him with rice delivered daily for every person he brought into his clan.Slowly, he worked to expand his clan, making it bigger and stronger.Ages later, Lin Xuan Qi stood at the apex of power, leading the most powerful clan in Da Qian.

What is the Law of Causality? When the preconditions are met, the corresponding effect is bound to happen. Su Xin, who activated the system, can awaken various Causality Law Superpowers.Concealment Prayer: With palms together, randomly teleport ten kilometers.Unyielding Dead: Resurrect for one hour after death.Other-Transformation: If you hold another person's item for more than ten minutes without being noticed, gain ownership of it.Self-Deception: Close your eyes for more than three seconds to enter a Stealth State.