Why are the middle ages refereed to the dark ages?

Because they were very "Dark" times.  There was the plage (Black Death)  and many others.  There were many wars faught in that time span.  It wasn't peacefull or safe unless you were a king or in royal family.  Thats why they were referred to as the Dark ages.

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.