Armageddon 2419 A.D.

Picture this: a guy named Anthony Rogers falls asleep in a cave for 500 years because of weird glowing rocks. He wakes up in the year 2419, and America is all jungly ruins because mean flying bad guys called the Han from Asia gassed everyone and took over. Rogers meets cool survivors like Wilma who zoom around in flying ships, and he invents super-strong armor that's lighter than air and rocket guns that shoot bad guys out of the sky, helping everyone fight back and start winning the war to make America free again!

In Philip Francis Nowlan's 1928 novella 'Armageddon 2419 A.D.', set in a dystopian future, the United States lies in ruins after a devastating 21st-century invasion by the Han, a techno-militaristic Mongolian empire from the Gobi Desert that employed paralyzing gas bombs to conquer North America, killing billions and forcing survivors into primitive, nomadic forest gangs amid overgrown urban wastelands. Anthony Rogers, a 1920s mine inspector accidentally preserved in radioactive suspended animation for nearly 500 years, awakens disoriented in 2419 to this savage new reality, where the sky-sailing Han dominate with ultralight airships and deadly disintegrator rays. Rogers rapidly integrates with the Wyoming League, a resilient American resistance group led by the grizzled Boss, and bonds with the resourceful aviator Wilma Deering, his romantic counterpart. Harnessing his 20th-century engineering ingenuity, he pioneers revolutionary technologies like the impenetrable inertron armor, buoyant ultron struts, rocket-firing pistols, and personal 'jumper' harnesses for aerial combat, turning the tide in high-stakes dogfights and ambushes that symbolize humanity's defiant resurgence against aerial tyranny.