My Power is Upgrading Everything (Rewrite) - Chapter 343: Ostera Race, Three Great Royal Families

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 avid Xianxia reader suddenly has his dream come true—he wakes up in a world of cultivation. The only problem? Maybe it wasn’t really his dream after all.Now, faced with the daunting reality of countless cultivation realms to climb, countless worlds to ascend through, and countless arrogant young masters to deal with, despair begins to settle in.Fortunately, a glimmer of hope appears amidst the chaos: a mysterious system that could change everything.Armed with elders, ancestors, and a sect leader—who are all actually his own avatars—he no longer feels completely overwhelmed.“At least I don’t have to do it all alone… well, technically, I do. They’re just avatars, after all.”

【Transmigration + Famine Escape + Farming + Infrastructure】Professional white-collar worker Xiao Cheng accidentally dies while saving a drowning child and transmigrates to a small mountain village, believing she's in a farming story. However, the system says, “Host, we need to survive by completing tasks first.”What? Fighting tigers? No, no, isn't that Wu Song's thing? I can't do that!What do you mean we have to migrate? I've just gotten my footing and you want me to move?Oh! Foreign enemies are invading? Then pack up quickly and run.What about becoming a City Lord? Too troublesome. I just want to be a slacker.Being a concubine? Get lost, you average guy, dreaming in broad daylight!Something or other every single day! I'm done, I want to retire and enjoy a leisurely life with my family!----- However, the system doesn't allow it and keeps popping up to demand attention, “Host, hurry, there's another task. If you don't do it, you'll be erased.”“You lousy system, I want to apply for retirement.”System, “Host, your application has been processed and rejected.”It's infuriating, how is this never-ending? I'm going to complain to Ah Mo......

An 18-year-old girl who lost her family in an accident, Yamano Mitsuha falls off a cliff one day and transferred to a different world with a civilization level of medieval Europe. Mitsuha who discovered it was possible to go and return to Earth after a deadly fight with wolves decided to live in both worlds.

「For the sake of security in old age, I will aim for 80,000 gold coins!」

I will try not to let strange things circulate and distort the progress of the world, but I won’t hold back for the sake of my easy life and safety! While carrying three handguns along with words and deeds that appear decent, in her head, Yamano Mitsuha is a sly girl.

Making an effort to make money even with a small body that looks like a child to foreigners!

Oh, my secrets are too dangerous, you said? It’s fine, it’s fine! I’ll transfer away when push comes to shove!