To achieve immortality, I cultivate using Qi Luck - Chapter 1565 - 609: Creating a Prosperous Era

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.

Yu Yi found herself transmigrated into a female protagonist in a xianxia novel, destined to suffer both physically and emotionally.The entire novel was 800,000 words long. For 700,000 words, she endured extreme torment. In the remaining 100,000 words, the heroine reconciled with her past, found true love without regrets, and achieved a happy ending with the male lead.Yu Yi absolutely refused to be this pitiful scapegoat.To avoid the main plot, she adhered to the basic principle of “where he is, I am not; where I am, he is not.” She laid low in her sect, dodging every opportunity to encounter the male lead.Five years passed, and she finally severed this ill-fated connection.The male lead married someone else. Yu Yi let out three wild laughs as she stepped out of the sect gates, happily rushing towards the colorful world outside.However, she didn’t expect that in her excessive joy, she would accidentally stumble upon the mu*der scene of the main villain.Yu Yi hid in the bushes, watching Xue Chenjing, dressed in white robes now stained with blood, slowly crushing someone’s skull. She was so terrified she didn’t dare to breathe.In the dead silence, a noisy voice suddenly rang out: [Master, look quick! It’s your wife! Your wife has finally come online. Isn’t she adorable, curled up and hiding in the bushes like that?]Yu Yi was shocked: Surely it can’t be referring to me?[She’s even wearing a red dress, matching couple outfits with you.]Yu Yi clutched her pomegranate-red skirt tightly, glancing at the hem of Xue Chenjing’s robe. What couple outfit? Isn’t that just stained red with blood?Xue Chenjing flicked the blood from his fingertips, his gaze sweeping towards the bushes. He asked in bewilderment, “Whose wife?”The system pulled out a masterpiece of literature, tapping the cover and asserting confidently: [Your wife.]

Jack transmigrated to a parallel world and locked on to a Judge System that provided rewards for punishing evil. Hence, an Adjudicator of Death who stood above the law was hence born.

Grace Lightsinger is just a simple farm girl.Ever since the death of her parents, she's been taking this slowly, one day at a time. That changes when she dies protecting a stranger. But instead of a peaceful afterlife, she finds herself reborn as an angel with a mysterious “Saintess System” that no one else can see. She's made to choose between three factions of gorgeous immortals: warrior angels who fight demons, healer angels who tend the wounded, and love angels who raise morale through very intriguing methods.However, unlike other angels who can only master one path, Grace discovers she has an affinity for all three. This hasn't happened since the goddess Eternia herself walked the heavens, which leads to Grace learning that she might be more than just a regular angel. She might be Eternia's chosen successor, herself.But not everyone in heaven is happy about Grace's arrival. The scholarly Choir questions her legitimacy, fallen angels show dangerous interest, and that's not to even begin talking about the demons she'll be fighting.Grace wanted a peaceful afterlife, but between training, fighting demons, and trying not to die of gay panic, she's about to discover that heaven is a lot more dangerous than she ever imagined.