Lord Summoner's Freedom Philosophy: Grimoire of Love - Chapter 322: The Mountain Tribes (2) The Chief Tournament

Killed by a Sage Emperor and reborn as his 13 year old self, Nie Li was given a second chance at life. A second chance to change everything and save his loved ones and his beloved city. He shall once again battle with the Sage Emperor to avenge his death and those of his beloved . With the vast knowledge of hundred years of life he accumulated in his previous life, wielding the strongest demon spirits, he shall reach the pinnacle of Martial Arts.

“Alas, this life is a failure; let’s see what the next life holds.” ... “The second life has ended, calculating results... Final rating: C+. Rewards based on rating: You may choose to inherit one item from Constitution, Skill, or Talent. Please select?” “Hmm, I choose to inherit the Talent ’Dynamic Vision’.” “Talent inherited... Congratulations on achieving the following lifetime achievements: Innate Grandmaster; Blessing of Many Offspring (10/10)” Achievement rewards: Two random rewards. You may draw from Constitution, Skill, or Talent, or choose to upgrade Talent level. Please select? ... A reborn individual, in possession of the treasure ’Hundred Lifetimes book’, reincarnates within the Cultivation World, undergoing endless cycles of rebirth without the bloodline ending or the soul perishing! The family he established ten thousand years ago has now grown into a massive entity that spans the heavens. The disciple taken in casually eight thousand years ago ultimately became the founder of a Great Sect in the Immortal Realm. The pet raised three thousand years ago has evolved into an unparalleled Demon Saint of the Otherworld. ... I am Zhao Sheng, and I shall cultivate life after life until Ascension!

She was bored, so the Emperor accompanied her as she played in the three thousand realms and caught a phoenix for her to sit on. When she has cravings, the Emperor crossed through space to gather all kinds of delicacies and immortal fruits for her. Later on, she liked little kids, the Emperor tricked her, saying if she becomes the Empress, she’ll get her own kid. And like that, she became the Empress and got tricked by the Emperor into bed. However, she reincarnated and forgot everything…..

- 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.