We can learn that the identity in America is revolved around multi-racial, diverse and very important society, which there are many races and religion but is also somehow confusing and difficult to comprehend as they are all different and the customs are also dissimilar.
We can learn that identity in America is incredibly important, very diverse, and hard to define.
Both of the main groups in the play, African-Americans and Hassidic Jews, are outsiders to some degree. However they are also incredibly different from each other in many ways.
Both groups somewhat define themselves by their outside status, but that does not necessarily make them similar, both to other groups or to each other within the group.
Identity is very important to America, it's also very difficult for people to conform to a group identity, each identity is unique even as it is informed by the group.