How were civilizations in Mesoamerica and the Andean region able to develop in different environments—that is, ones without major rivers—than those in Afroeurasia?

What does a most-favored-nation (mfn) status mean? a country pays the same tariffs as those paid by all mfn countries. a country has a special exemption from all tariffs in the united states. a country has special licensing agreements with u. s. corporations. a country is exempt from product standards that make it expensive for goods to be imported.