Start With Contracting Sprites - Chapter 657 - The war - ridden world of summoning spirits

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.

Jiang Yang traveled to a parallel world and became a garbage undergraduate graduate.

He got married as soon as he graduated, and reached the pinnacle of his life. Then he achieved nothing, his family was poor, and he was unemployed at the beginning. He only had one skill. Just when he was in despair, his wife raised his chin, “I will support you.”

She took off her glasses, and the big devil who once made the singing world tremble came back.

after many years…

Jiang Yang watched Huayu being turned upside down under the ravages of his wife, he had no choice but to spread his hands, blaming only his company for dismissing him.

As for him, he is the only king of entertainment who can subdue the devil.

This book is also known as: [I am a man with BGM] [My wife is a big devil]

【Dog food, daily life, entertainment article】

- Description from novelbuddy

Humanity was on the brink of destruction. Muyoung, an assassin from the Forest of Death, fell to his knees. There were corpses all around him. For years, he had worked for the Forest of Death and had finally been able to eradicate them. Now, he, himself, was about to die. He closed his eyes as he felt his heart stop beating.

My name is Kaelith Yurei , and I am a first-year student at the Shin'ō Academy in the Soul Society. I have a friend who is destined to be quite famous in the Soul Society; his name is Sōsuke Aizen.Unlike this ambitious and idealistic friend, my goals are quite simple: through hard work and diligence, I aim to graduate and become a seated officer in the Gotei 13, from which point I will… I bounded with who!?Whenever Aizen enhances his strength, my power automatically synchronizes to match his level.Therefore, what I need to do from now on is very clear.“Sōsuke, you need to work hard. As long as you put in enough effort, I can live the life I desire!”