MTL - The Great Era of Rebirth: 1993 - Chapter 198 , does this voice sound familiar? (please subscribe

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.

Five years, Nan Xia devotedly cared for her husband who was in a vegetative state. After finally waiting for the man to wake up, what she got was: “She's pregnant now, wanting a divorce is a bit difficult, just throw her into the lake and let her fend for herself.”Five years later, Nan Xia changed her name and identity, with three adorable children, she sets out to punish the scumbag man, trample on the white lotus, and vows to make the scum man and the vile woman pay in blood!Yet the man pulls her into his arms, softly coaxing, “Honey, be good, let's not divorce.”Nan Xia's expression is icy: “Sorry! I don't know you at all!”

Humanity was on the brink of destruction. Muyoung, an assassin from the Forest of Death, fell to his knees. There were corpses all around him. For years, he had worked for the Forest of Death and had finally been able to eradicate them. Now, he, himself, was about to die. He closed his eyes as he felt his heart stop beating.

Klein’s greatest wish is to transmigrate to another world and live life in an isekai, just like in anime, manga and novels. However, fate is on his side and the typical truck that the main characters always carry in isekai runs over Klein. But, to his bad luck, he lived a few more days in the hospital and, just on the day he died, Klein heard a ⟨⟨-DING-⟩⟩ that he knew it meant. That was the day of his death, but also the beginning of his adventure into another world.