It is typical for adolescent Americans to have their first jobs working for their neighbors. Grade school children often take care of their neighbors’ pets when the neighbors are on vacation, while older children tend to find employment as babysitters and lawn mowers.
Block parties (parties exclusively for people living in a neighborhood) are also common. They give neighbors a chance to get to know each other, which makes them more comfortable to help each other.
Additionally, if one of the neighbors experiences a sudden misfortune (death of a family member, lost job, etc.), it’s common for the other neighbors to pitch in bringing the person food and other small gifts for a couple of weeks following the incident.
pitch in (verb): to begin to work; to contribute to a common endeavor. First known use was in 1843. Synonyms include chip in, kick in, contribute.