The important act of holding all other variables constant while examining a particular variable is known as:

The answer is ceteris paribus. This is a Latin phrase that means "other things equal". Other English translations of the phrase also are the following: "all other things being equal" or "other things held constant" or "all else unchanged". This is significant to Economics since it aids isolate multiple independent variables affecting a dependent variable.

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.