In the concentric zone model of urban growth, cities tend to grow outward from a central area in a series of growth rings.
grow inward from the suburbs in a series of growth rings,
develop in a series of corridors that extend from the downtown.
include more than one center around which activities revolve.
be surrounded by a beltway that connects suburbs to inner cities,

i don't know why don't you google it?

the real gdp increased by 4.1%

explanation:

might not be right, i think i'm correct, but i might be thinking of last quarter

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.