MTL - Global Reincarnation: My Own Story Library - v8 Chapter 7 Optimal solution, eliminating redundant

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.

An engagement paper to lock one’s destiny. With her family facing financial difficulties, she marries into the family of the richest man in Qingzhou as his wife. Her Mother-In-Law’s doubtfulness; her husband’s childhood sweetheart; her mean elder sister-in-law; her narrow-minded younger sister-in-law… Being inferior, Sang Wan withdraws without a choice. As time passed, she ended up being lonely and died tragically.

Reborn on a sedan chair, how shall she proceed? Standing right at the cause of the tragedy when everything restarts, can she change her fate and find her beautiful melody?

- Description from novelupdates

My name is Chen Huaian, and I’m dying of cancer.In my final days, I became obsessed with a game where you raise a virtual girlfriend.I spent all my savings buying her cultivation manuals and magical artifacts. Though my wallet was empty, I smiled like never before.I always thought it was just a game—until one day, my virtual girlfriend sent me a mystical pill.The next second, the pill materialized in my hand.I… might not have to die after all?——————————————————My name is Li Qingran. I was stripped of my cultivation, had my spiritual roots torn out, and was exiled from my sect, left to die in a broken-down hut.Just as I thought my life was over, I encountered a mysterious benefactor who never showed their face.This enigmatic figure healed my wounds, guided my cultivation, and helped me grow stronger until I became the most powerful sword cultivator in the Cangyun Realm.But the Cangyun Realm is on the brink of collapse. Spiritual energy is drying up, and the path to immortality is fading. Rumors spread that a mighty immortal from the Celestial Realm plans to merge our world with another on the verge of a spiritual resurgence.A great era of chaos is coming.And even immortals may fall.Desperate to find my benefactor, I scour the world for their traces.I will protect them—and become their eternal partner in the Dao!

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates