First Assistant's Petite Wife Has Space - Chapter 364 - : The Four Little Ones Making a Commotion

After annihilating Han, Zhao and Wei empires in succession, the dynasty of Qin is ushering in an unprecedented flourishing age with powerful cultivators emerging endlessly. People take pride in being part of the Qin dynasty. However, Ding Ning, a young lad of humble origin in Changling, Qin, is determined to subvert this dynasty and kill the emperor who breaks in the Eighth Realm.

- Description from Novelupdates

Oliver West never expected his quiet life to turn into a nightmare. The boy who once shared secrets and summer adventures with him has become someone he doesn’t recognize. Keiran Morrison - tall, dangerous, and devastatingly handsome - now uses that same intensity that once made Oliver’s heart flutter to terrorize him instead.Every day at Riverside High is a battle for survival. Every corner could hide a new humiliation. Every moment of peace is just the calm before Keiran’s next storm.But why does Keiran’s hatred burn so bright? What happened to turn childhood love into adult cruelty? And why, despite everything, does Oliver’s heart still race when Keiran gets close - even when he’s terrified?Some mistakes can’t be forgiven. Some wounds run too deep to heal.But sometimes the line between love and hate is thinner than you think.

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.

In the Dragon Abyss Empire, nestled within Clear Water Town, young Jiaang Lin awakens from a brutal beating by his cousin Jiaang Ren, only to discover he has been reborn into his younger self. Once a mocked disciple with blocked meridians, Jiaang Lin had risen to greatness in his past life as a prodigious warrior and Pill Saint. Now, with a second chance, he vows to protect his loved ones and conquer his enemies. How will Jiaang Lin change his destiny and ascend to the pinnacle of martial prowess once more?