Do they speak English and understand the US? If so, while it is almost impossible to choose from a nearly inexhaustible list of cultural masterpieces from the last 2700 years that cross all natuonalities and races, I would follow a version of Ocam's Razor and Murphy's... so today I would suggest "Wait in the Truck" https://youtu.be/YsMB0i5YTOc

It speaks of a mindset, a sense of morality, a justice system, human foibles, compassion, strength, and sacrifice- in addition to having all of the basic sound components that demonstrate a fairly literate society without trying to wow them by saying "hey look at us, we general relativity and can do some Chopin and Bach" ... just imo