mainly adverts and illustrations from the 1950s and 1960s (pre Vietnam era).
however, also older materials, and 1970s/1980s are allowed.
fake 1990s retro/imitation is not allowed.
if possible, only add the highlights (if you think peole would buy it nowadays if they see the artwork).
as the group name is implying, mainly works from the U.S.A.
if it is extraordinary, special artistic style, any other country is also allowed.
propaganda against U.S. is not allowed to be added. anyway, most likely this group is about commercial advertising, and science fiction illustrations, not political propaganda. if there is no direct picturing of enemy nations, it can be added.