What does it mean to be isolationist

An isolationist is someone who prefers staying away from other groups and their affairs. Isolationists are typically focused on political affairs, and advocating for staying away from other country's politics and policies.

Ongoing civil wars western roman empire finally collapsed476 c.e. romulus, the last of theroman  emperors in  the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the  roman empire  had brought towestern  europe for 1000 years was no more.