What two general categories of speech has the supreme court distinguished?

Commercial speech & political speech

Commercial speech refers to speech—printed, broadcast or on the Internet—that advertises a product or service. Commercial speech is given much less protection as compared to political speech as it may be regulated by the government in cases where political speech would be protected.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.