Apocalypse with my SSS Harem Beauties - Chapter 54: Ripple Of Energy

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.

Betrayed by his beloved queen.Stabbed by the very men he raised to power.King Alaric died with a broken heart… and a blade in his chest.Fate’s twisted joke?He’s reborn—in chains.Collared. Beaten. Sold like cattle.Once a mighty ruler. Now a slave in a world of magic, monsters, and bastards with crowns.His new master? Arrogant with even little much money, and the personality of a wet cabbage.And the wife?Let’s just say... she deserves better. Much better.Just when he thought a future of licking boots and scrubbing chamber pots—[DING! You have awakened the Domination System.]Rule the strong. Break the proud. Tap the wife. Steal the life.“I—wait, what?”[New Quest: Subjugate your Master's Wife.][Reward: +500 Power | Domination Skill Unlocked – Command Voice][Bonus: Do it on the master’s bed for extra EXP.]He grins through the pain, eyes burning with ambition.They thought they broke him?They just gave him a reason to rise.Power. Revenge. Pleasure.He’ll take it all.------------------Note- No ntr, no yuri.Mc won't abandon his women, neither he will force them, and not every women will be subjugated.And System isn't all about subjugating others wives, it's just one of it's features...

Reborn in the early 1980s, what Lin Xia wished to do was to be “idle” to the extreme, and so wealthy that it dripped off of her...Having another chance at life, all she wanted was for her brother to live a long life of a hundred years, her younger brother to attend university, and to set up a small business for her sister;Yet, why were two highly eligible men taking turns to express their feelings for her?

'Did I reincarnate as the First Born son of a noble???'Jack was reincarnated as Jack Kaiser. Firstborn son of Alaric Kaiser, the strongest duke in Elysium. Born and destined for greatness. Or so they said.In a world ruled by Magic and Martial Arts, where talent determines everything, Jack's future seemed guaranteed.Until an unfortunate hunting trip left him in a 10-year coma.A system awakens within Jack. Granting quests and accelerated progression, Jack realizes he might have a chance to reclaim his destiny.In a world of dungeons, monsters, a political challenges, Jack will rise to his new title and become the Strongest Kaiser in history.