It would be an "a. Embargo Act" that often prohibits trade with another country, usually either to increase domestic production or to punish a competing country.
The 1920s! This is time when music was played on the radio and was the beginning of modern music era. =)
Hope that helps! UnicornFudge aka Nadia
Salt was one thing they didn't bring if that helps. Salt was an item found under dried up riverbanks along the Saharan desert.