In the movie serial - which may not be counted as a true movie by some persons - Flash Gordon's Trip to Mars (1938) Flash Gordon, Dale Arden, and Dr. Zarkhov return to Earth from the planet Mongo in the first chapter.
Soon after returning, Dr. Zarkhov is giving a speech where he speculates about aliens from outer space travelling to Earth as Zarkhov & ...
I reckon it harkens back to America’s roots as a frontier nation.
In 1862, Congress passed the Homestead Act, which granted ownership of up to 160 acres of western land to any citizen willing to build and maintain a farm there for five years.
“Homesteaders” relied on their rifles not just for hunting food, but also for home defense.