Why was Firoozeh embarrassed on her way home from school in Chapter One?

Firoozeh was embarrassed by her mother's inability to find her own country on the map. She was afraid the kids would think she was stupid. Although they lived only a few blocks from school, Firoozeh and Nazireh got lost on the way home. A kind neighbor helped them find their way home. Firoozeh, like her father before her, was impressed by how kind Americans were.