Worldwide Survival: Begins As An Island Owner - Chapter 341 - : All With Trump Cards, Memory Read

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.

Daytime belongs to the human world, while Deceit Night returns to the netherworld.Since the arrival of the sinister night, demons and evil spirits have brought disaster to humanity, and generations of our ancestors have struggled to survive.This blade of mine can eliminate evil, slay demons, defeat wickedness, exterminate devils, destroy evil!From now on, nighttime shall be like daytime!

After losing his parents to an accident, Haruto is thrust into a state of depression. Realizing he never had the power to change things, he eventually took his own life. Before moving on, he’s selected by beings greater than his understanding to balance out a world suddenly facing peril. The world of Mordell, where demon-like creatures and beasts roam, and Guilds of ability users called Warlords are the force to combat these creatures. Armed with the power to change things, he has the choice. Continue living in despair or accept his second chance and become a true Warlord.

What happens when, in the midst of struggling to keep up with life, you suddenly discover that you were a princess in a past life? Now, you're just a waitress with a drunken mother and a pile of bills to pay. But deep down, you know one thing: you’ll find the stupid jerk responsible for ending your royal life, no matter what it takes.Alexia POV:Then there are the spoiled, narcissistic rich jerks who think their daddy's car gives them a free pass to treat women like objects. Not today, Satan. These guys are like walking perfume ads with egos bigger than their bank accounts. I swear, they should just marry themselves—they're clearly their own type.When one of those jerks lands at my table, I can smell the entitlement from a mile away. I don't even wait for the inevitable sleazy pickup line or the “accidental” brush of their hand against mine. Nope. I pawn them off on one of the other waiters faster than you can say “unpaid rent.”