Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ - Volume 8 Chapter 1

"To be a star is to own the world and all the people in it."
...
Two years ago, Aiden came to the United States to experience the American Dream. But after sleepless nights of struggle, just when he was on the verge of giving up, a translucent screen flashed in front of him - it was a System!

A System that would make him embark on a journey to Hollywood. And today, he takes his first step by mesmerising the world through his singing!

So come and join him, for his journey, has just begun.

Singing? I'm the best at it.
Acting? I have Oscars lying around in my bathroom; you can practice your acceptance with it.
Movie Direction? They call me the king of the box office.
Novel Writing? Two words: Best Seller.

From creating the highest-selling music album to becoming the world's most famous superhero - Aiden will do everything to write his own legend.

--- All the songs and movie scripts in this book will be Original, and I'll be the one writing them. ---
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Cultivators all have a soul beast, one that awakens at 13 years old.
However, Ye Chenfeng lacks one and is subsequently banished.
Ye Chenfeng obtains the favor of the heavens after years of humiliation.
With his gifts, he will walk his path to the strongest.

- 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.

The youngest Wiseman of the continent, Chu Tian, has traveled 30,000 years back in time to the age of antiquity due to an accident.

This is a prosperous era. Rare herbs, minerals, treasure relics and monsters can be easily found throughout the land.

However, this is also an undeveloped era. Communications, traffic, martial arts and technology are in its early stage of development. Prosperous cities lack lighting while its citizens are uneducated.

Our decisive MC using his future knowledge creates Magic powered light bulbs, magic powered telephones, magic powered cannons, magic powered computers, artificial intelligence, psyche internet. 30,000 years worth of knowledge allows him to create miracles and shine brightly in this era. Allowing him to conquer the land and sit firmly on the throne of the 10 realms.

- Description from Novelupdates