In The Namesake, how are Ashima's address books symbolic?

Ashima carries multiple address books with her after moving to America in "The Namesake." In her old life, prior to her arrival in the States, Ashima remained in the same few houses for her whole life—only 3. Now, having come to America, she is constantly moving.
Ashima uses these address books to keep a record of the locations in which she has lived, for memory and in case it is ever brought up and she needs a record of it. This is, sadly, an indicative state of affairs of many immigrants, not only to the United States but throughout the world, particularly those of low economic status. It symbolizes their upheaval and the fact that they feel disconnected with no permanent dwelling. Many immigrants are, literally, nomads in their new country, moving from place to place frequently, but even those who aren't can tend to feel separated and without firm ground because they have lost their homeland but do not feel connected to their new land.

Ashima's address book symbolizes how she deals with her new life in America. Prior to her arrival in the United States, Ashima had only lived in three houses in her whole life. Yet since setting foot on American soil, Ashima has been forced to lead an itinerant lifestyle, constantly moving from place to place. In her little address book, she carefully notes down each address at which she and Ashoke have stayed over the years. Even when they move to another address, Ashima still keeps the old addresses in her address book, which becomes a symbol of the culturally rootless existence that she's led since coming to America. Finding it hard to adapt to such a completely different culture, a whole different way of life, Ashima holds on to the evidence of her previous addresses as a way of providing her existence in the United States with some sense of the past, to relieve the chronic uncertainty of the present and the future.