My Fierce Tigress Wife - Chapter 176 - The Tiger King’s Cave’s System and Path

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.

Billions of people around the world were transmigrated to the game world of “Shining Era.” Everyone became lords and possessed their own land.

They recruited troops, gathered resources, occupied mines, attacked cities and built up their empires.

In this world of lords, the most important resource was the troop lairs where they could recruit troops.

However, the potential of these lairs was fixed. If anyone wanted to obtain a top-level troop, they could only do so by defeating powerful wild troops and occupying their lairs.

However, Richard discovered that he could actually improve the level of troop lairs directly.

From then on, various powerful troops were groomed by him.

When the other players were still leaping with joy from obtaining a high-level troop, behind Richard were a Desert Pharoah, a Demonic Scorpion King, a Mechanical Giant, a Demon Baron, a Blood Archduke, a Five-colored Evil Dragon, and a Fallen Angel.

From that day on, a prosperous and dazzling oasis city was established in the desert. As for Richard, he became the ruler of the desert.

I think my husband wants to kill me.

Whether it’s forgetting to turn off the gas or finding the bathroom door locked after I just finished bathing, it all makes me feel that he wants to kill me.

I know that I shouldn’t be considering this because we are a gay couple and we have been together for seven years.

Our relationship is also stable, and he is very good to me.

But I really think he wants to kill me.

- Description from Novelupdates

500 years ago, Chen Xi was devoured by a crack in the void and was transported into a cultivation world.