MTL - Worldwide Survival: Begins As An Island Owner - Chapter 249 [Four new rule powers] Two in one

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.

Welcome to Freia. A continent where evil magi ruled. Until firearms came, that is. Now the people live free of those demons…

More, however, must lurk beneath the surface.

Claude, a transmigrator from another world, finds himself in the midst of this changing world, attending ‘middle school’. Or, as he calls it, ‘boot camp’. His destiny was to graduate and join the military, but the future is seldom so simple.

His life, and the world, is set on the path of upheaval and chaos the day he finds a cookbook.

A magical cookbook.

- Description from novelupdates

Before they got married, Laurent already knew that Dave Washington had another woman in his heart, yet she still chose to marry him because Dave had always been the one she loved. She loved Dave, but his heart belonged to another woman. It was said that this woman loved another man, who happened to be Dave's illegitimate half-brother. Laurent believed that having a child would secure their shaky marriage.Until one day, the woman Dave loved finally told him, “Actually, the person I love is you.”Laurent had devoted her youth and energy to this sensational and messy love story, only to helplessly watch it collapse. Heartbroken, she chose to divorce.She thought Dave's infidelity would make her easily give up on the house, car, and property during the divorce, with the only request being custody of their daughter. But to her surprise, Dave insisted that she was unfit to raise their daughter and refused to give her custody.In order to fight for her daughter, she embarked on a long and exhausting legal battle.She said to him, “You're so persistent—aren't you worried your lover is waiting for you anxiously?”Dave smiled and replied, “If you have time to worry about her, you might as well get a new lawyer.”In a fit of rage, she threw a cup of water in his face. “Dave Washington, you're despicable!”Yes, every lawyer she hired was bought off by him with large sums of money. Finally, disheartened, she gave up custody of their daughter and decided to leave the country to heal.But he sent someone to intercept her at the airport...

A rookie clerk asked his senior curiously: I heard our President is already married?