Marvel: What If Thanos Adopted A Saiyan? - Chapter 18: Unconventional Space Jump

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.

Logan Mercer, an orphan barely surviving on his own, awakened the Spending System as a child.But as a broke teenager struggling to even pay his rent, how could he possibly use it?Bullied by his classmates and cast aside by society, Logan’s life changed the day he was suddenly surrounded by men in black suits.“Your father has been missing for over a year. As per his will, you are to inherit all his assets,” they said.To his shock, Logan learns that he was the sole heir of the Mercer family fortune — and with it came control of major businesses, unimaginable wealth... and the constant threat of his father’s competitors.“System, redeem one billion dollars,” Logan said.[Redeeming One Billion USD...][Congratulations! Your E-rank fire affinity has evolved into SSS-rank Phoenix Flame Affinity!]Now blessed with talent and wealth, all that's left is training relentlessly, growing his core, and unlocking even more different affinities within it.Follow along as Logan uses wealth and determination to rewrite his fate and grow stronger than anyone ever imagined.

Cale Virel was just a normal office worker.He was bored and tired of his life, waiting for it to end.And then—Bam!One night, two robbers targeted him!And instead of surrendering, he fought back!Though, in the middle of doing so—PHUCK!He got stabbed and died...He didn't regret it though.After all, he's not really afraid of death anymore.And so...He rested in peace..........Or so he thought!Cale Virel—“Huh? What the fuck?”He woke up as a young slave named Kaiser in a different world!And given another life he didn't ask for again—“Fuck this shit!”Cale, or should I say—Kaiser—“Ugh, whatever.”Decided to live it... By just doing whatever he feels like until he dies.

In the back alleys of the Central Empire, there appears a monster that eats people. And that’s me.