Your answer to this question is false.
In the late 1920's, the economy took a turn for the worst as the good times came to an end... and that's just what covered up the economic problems- the good times and festive mood of the 1920's. Everybody was to worried about what to wear to parties and how to dance the Charleston to see what was going on with the government.
Mountains isolated the city-states Athens and Sparta. Those city states had different cultures and they were at war.
Hope this helps.