MTL - I Have A Cultivation World - Chapter 14 Wu Wan

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.

Travel to the primitive world, open up wasteland and farm land, tame animals and fish, build houses…

Jiang Xuan wants to create a tribe of his own!

- Description from novelbuddy

He was once a kind boy — loyal to family, faithful to love, and full of hope.But kindness means nothing in a world that spits on your loyalty.Roman died betrayed.His stepbrother beat him.His girlfriend cheated.His family used him like a slave — and when the world ended, they threw him to the undead.But death wasn’t the end.Roman was reborn — weeks before the apocalypse that would erase humanity.And this time?No more mercy. No more weakness.This time, Roman builds his empire in the shadows, manipulates nations, steals resources before the collapse, and creates a stronghold while the world sleeps peacefully — blind to the hell that’s coming.> What?! A supermarket in New York is completely wiped out overnight!Japan’s largest food storage warehouse was found empty — zero inventory, massive losses.Similar cases in South Korea and Australia? No trace, no witnesses. Just... gone.One man is preparing.One man is rising.Roman.But just when he thinks he's the only one pulling the strings in the dark...Others begin to move.Reincarnated. Ruthless. Just like him.The game is no longer survival.It's domination.In this new world, only one king can rule from the shadows.And Roman will burn the world before he kneels.

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