The both civilizations had city-states
I believe it's A. the others one's seem less likely.
Because the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan.
The U.S. entered a severe recession.<span />
Greece had lots of mountains and valleys, and very indifferent terrain which lead to numerous different groups in different parts of Greece, instead of just one very powerful united empire. Along with this, the Mediterranean caused them to want to explore and branch out and not stay in one place with only one empire.
