Why does a conflict inside a place invite threats from the outside? Athens and Sparta

while two forces is focused on eachother, an outside force can come in without being stopped, they aren't noticed. they can then take out one force while it isn't defending against the outside force.

Explanation:

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

is there a year set? the question is incomplete