What is the lesson in the book Esperanza Rising?

The book esperanza rising is about a girl that speaks shainsh.she lives in Mexico in aguascalientes.her papa deaded.she and mama,alfonso,hortensia,and miguel had to go to the u.s in los angel.she had to go to a camp that was dirty and esperanza didnt like that she had to live in a camp on bank-beds.then she met a little girl name isabel.