Douluo Dalu 2: The True God King - Chapter 241: [DD2]:

Noir, third son of a “beggar noble,” lost his job and was at a loss, but fortune struck just as he was contemplating becoming an adventurer.

The God of Magic stopped blessing his believers.

The Tower of Magic, where the mages gathered and worshiped him was destroyed.

Magic Fell.

The surviving Mages were looked down upon by the rest of the world.

Normal Mages, that is.

The Mages from the Strongest Magic Family, the Vesta Family, were an exception.

For 5000 years, the Vesta Family continued to produce exceptional Mages that were strong enough to resist other forces which came after their family heritage and treasures even without the Blessing of the God of Magic.

Now, however, the Vesta Family found themselves in a difficult situation where they didn’t have a single capable heir.

That was until, Christopher Davis, an underworld Gang Leader, transmigrates into the body of Vaan Astra Vesta, a well-known pushover and the ‘waste’ of the Vesta Family.

Christopher, now Vaan, soon realized that he could see otherworldly magic spirits with knowledge so vast that the Magic books that the Vesta Family treasured for 5000 years were nothing in comparison.

That, combined with Vaan’s own God-like Talent,

The ‘Hope’ was born.

A prodigy strong enough to not only protect the Vesta Family and its treasures,

A prodigy who will restore Magic to its former glory was born.

“Haa!? Who da fuck said a Mage can’t use fists!? That crab-like face of yours, I’ll punch it till it is deformed into something better looking!”

And of course, Christopher’s gangster-like tendencies won’t just disappear.

……………………………………………………………

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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 a story of an ordinary boy gaining unusual powers from his nightmares… It all started when Lin Sheng experienced something strange on what he thought was just another normal day. He begins to have recurring dreams that lead him on an incredible journey of discovery as he encounters spine-chilling monsters and elusive secrets.

- Description from Novelupdates