The Cultivator's Reborn to 1970s - Chapter 188 - 154

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.

Nascent Soul True Monarch failed in his celestial tribulation and returned to his student days.2013, when the mobile internet was just emerging, amidst the surging tides of the era, a cultivator's daily life.

Yang Yi was orphaned as a child. Foul play was ruled out by the authorities, but Yang Yi always suspected otherwise. Finally, once he was older, he met one of his father’s old friends who revealed the truth about his parents’ deaths. His father was an intelligence broker and had stumbled upon a mysterious, powerful independent spy organization. Both his parents’ were murdered to ensure the organization remained a secret.

Since he was unable to forget why they died, due to his eidetic memory, the only way he could be at ease was to seek revenge. In order to fight against the mysterious organization, he would first have to train in the art of espionage. However, not even one of the national spy agencies was willing to accept Yang Yi into their ranks due to his father’s sensitive identity.

Left to forge his own path into the field, he seeks out his father’s old allies for help. He learns how to be a spy in unexpected places while gathering the resources and allies necessary to form his own private spy organization.

Follow Yang Yi in his quest for vengeance! Follow Yang Yi as he prepares for A War Between Spies!

- Description from Novelupdates

In a humble village untouched by ambition, ​Hua Jin lives an idyllic life as the adored daughter of a farming family—a rarity in an era where sons reign supreme. Content with her simple joys and doting kin, she dreams only of peace… until the skies turn vengeful.But Hua Jin has a secret: a mystical space brimming with untold resources. While others scramble when droughts scorch crops, floods drown kingdoms, and plagues darken horizons, she smirks. “We’ve got this.”Yet survival isn’t just about hoarding grain. With her family’s unwavering love as her shield, Hua Jin masterminds a laid-back revolution: turning their farm into a fortress, bartering wit for wealth, and outsmarting fate itself. Who needs panic when you’ve got a lazy genius with infinite storage and a clan that laughs in the face of doom?