america is a place for amir " to bury his memories" and baba "to mourn his"? what dose this mean?

For Amir, America is a place to bury his past and add on new memories and finally forget what happened in Afghanistan. For Baba, it is not the same; Baba no longer holds importance as member of society; his life has changed drastically. he has difficulty adjusting and wishes for the life he was forced to leave.