One Moo'r Plow - Chapter 46Book 1: : IV

After getting betrayed and killed by the only person she’d loved, Miss Shang wakes up in the body of the cowardly crown prince Shang Wuxin, who, due to her own circumstances, was actually a girl cross-dressing as a boy. After inheriting the crown prince’s memories, Shang Wuxin has three things on her agenda:

1. Clean up the house

2. Gather loyal followers and soldiers

3. Get the throne

- Description from Novelupdates

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.

Introduction: Su Muge, a God’s favored girl in the medical community, became an ugly girl due to time-space travel. Her father disliked her and her mother was too cowardly to protect her! Xia Houmo, a lonely wolf who was haughty and ever triumphant in battlefield, was asked by the emperor to marry a useless and ugly girl! On their wedding day, there was an assassin and he took her as a shield, as a result, she was wounded. Su Muge smiled slightly with crimson eyes, “Xia Houmo, I owed you, and I pay you now.” Seeing her red blood, his heart hurt… “Su Muge, you owed me too much and you must pay me birth after birth!” The heroine was not beautiful and not omnipotent, but she had golden light and magic hand.

The most successful businessman of his time, who started from being a homeless orphan, died indignantly because of being plotted against by his most trusted aid, his own brother.