How does belonging relate to "The Outsiders?"

I will take this from a socio- economic point of view.  If
we examine the rivalry between the Socs and the Greasers from a class standpoint, the
work reflects how those individuals who are marginalized seek to find some level of
belonging from a social order.  The Greasers are marginalized, lacking socio- economic
power in the class setting.  Infact, the Socs are shown to be more socially destructive,
but because of their economic status, they are made to belong
more:

The rich Socs "jump greasers and
wreck houses and throw beer blasts for kicks, and get editorials in the paper for being
a public disgrace one day and an asset to society the next." The poor greasers,
conversely, "steal things and drive old souped-up cars and hold up gas stations and have
a gang fight once in a while.

In this
light, one can see how the book makes the argument that class and economic standing play
a major role in the notion of exclusion.  Those who are excluded, such as the Greasers,
have to turn to others, to one another, in order to find some level of belonging for
they are not experiencing it in the general social configuration.  Thus, the book argues
that class and class systems play a large role in determining
belonging.