Against The True Gods - Chapter 20: Coming of Age

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.

This is the story of how I became the greatest genius in the history of humanity, destined to go down in the annals of history for all eternity!This is the story of how I made humanity what it is today.It all began on a fateful night in New York. With a certain peculiar dream.The Universe is grand and mysterious. What's important remains hidden...

The female protagonist transmigrated into a wretched, lazy, and gluttonous villainess in a farming family!Her notorious reputation, fostered by her overly pampering mother, alienated the entire family. See how Jinhua cleanses her name, becoming diligent, brave, and the applauded golden girl everyone praises.With a wretched mother, a sick father, a stepsister, four brothers, and a bunch of nephews, all dead broke and needing support, poor and infighting, what to do?No worries, with the System in hand, I have the world!Harmonize the family, build wealth and prosper.The belle of the villages for miles around, Jinhua the beauty!……Mountain man, what was it you said before? You'd rather die than marry her, and even one more glance would shorten your life?A certain mountain man: No, no, no, wife, you must have heard wrong! I said I'd rather die than not take another glance, and I'd shorten my lifespan just to marry you.Hmph, that's more like it!!

In previous life, she was ignorant and naive. She was a “villain” owning a horrible reputation ever since childhood. She was framed by her friend, betrayed by her beloved, and ended up alone and died miserably. When she was reborn in the 1980s, she vowed to recognize the true nature of the people around her and work diligently. In this life, she would never let her younger sister die for her again. She will be an excellent female soldier, a pious daughter, and a qualified elder sister.Let's watch how she goes all in, saving her sister from great distress. She will turn the tide and lead her family through the reform and opening-up, striving for prosperity and a better life.