One Piece: Supreme Check-In System - Chapter 40: Walking Around in Fish-Man Island

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.

With a marriage contract forcefully done, he married her, and all she could do was comply, and resent him deeply for that and for all the following misunderstandings they faced, and she understood too late she loved him.

But after a life of misfortunes, she’s reborn to the very beginning, the day he told her they were married, and she was determined to cherish him in her second life!

Lin Mu Mu’s life goal is to : grow flowers and plants, and take care of Yun Ting.

Yun Ting’s life principles are : Love Lin Mumu, Love Lin Mumu, Love Lin Mumu!

- Description from Novelupdates

The mid-level boss of my company’s AAA-game.

Introduction 1: The villagers, when mentioning Zhuang Qingning who had no parents, then fell ill and chose to live on her own rather than being fostered by her uncle's family, they sighed and shook their heads, thinking she was paving her own way to death.But who would have thought, she started a workshop, bought a shop, built a house, lived comfortably raising dogs and cats, and everyone who got close to her flourished financially?The villagers: Is it too late to get in good graces with the God of Wealth now? Awaiting your response, it's quite urgent......----Introduction 2: Everyone in the capital city sighed over the good fortune of the Prince Qi, who was unparalleled in his beauty, for he followed the wishes of the late queen and married an ordinary rural girl, thereby giving up an ideal marriage.But who would have thought, the prince was so considerate of his wife, spent fortune to bring a smile to her face, defied orders just to protect her, totally behaving like a man deeply in love......All the people: Excuse me, is it too late to start shipping this couple now?----This story is about a rural woman growing step by step, expressing warmth, lightness, encountering thorny paths and joyful achievements alike, where lovers eventually marry, and there is retribution for good and evil.