I Became a Plutocrat in World War I: Starting with Saving France - Chapter 56 "Comrades in Arms

Li Yiyi never expected to be chosen by fate, being suddenly ripped from the modern times to the ancient times. It wasn’t a full-body transmigration, just a soul transfer. Heaven must have thought it would be too exhausting to send everything over, so only the essence got transferred.In ancient times, Li Yiyi became Li Suniang, a newly widowed woman with a young child. While technology in ancient times wasn’t advanced, the air was fresh and there was no need to worry about pollutants. All the food was purely organic with no pesticide residue or concerns about genetically modified ingredients.It was often said that widows attracted trouble, and sure enough, this young widow caught the eye of a scarred man in the village. Despite his fierce appearance, he turned out to be a gentle person. In the end, the scarred man married the widow and, together with her child, and they began a life filled with mutual support and raising a family.

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.

She, a 21st century mercenary queen, had crossed over into a tragically betrayed body of a waste. Waste? She will show them what it means to be a waste! Betrayed? With the Ancient Manual in her hands, she will astonish all the despicable men and cheap women!

A talented young man, Cyril Felling, just entered a prestigious academy of the great Empire, ready to begin his new life. Everything was supposed to go well.But suddenly he started seeing a strange woman trying to talk to him that no other human could see.Next, there was a student from the same grade saying she could see the future and that the world is in danger.And finally he discovered that his body was hiding some mysteries as well.All he wanted was to learn magic and prepare to fight demons in peace, yet he keeps encountering one weird situation after another.