To import and export the goods
Lots of random acts/laws were put into place to make things hard for southern blacks. For example, literacy tests and fees to be able to vote were instituted in some states as blatant ways to stop blacks from voting.
Answer:
Roman culture did not disappear because the traditions were kept alive by leaders in Constantinople.
People who never develop symptoms or are not yet showing symptoms (pre-symptomatic) might not know that they are infected but can still spread rona to others. Masks also offer protection to the wearer.