A French aristocrat and political philosopher who traveled to the United States in the 19th century. He observed and documented the importance of associations and social trust within American democracy.

A cohort of individuals born between 1910 and 1940 characterized by high levels of civic engagement and community involvement. Their values were shaped by World War II and a pre-television era.

A generation born between 1946 and 1964, identified by Putnam as being more individualistic and less civically engaged than previous generations. They came of age during the Vietnam War era.

The generation born between 1965 and 1980, noted for having lower levels of political involvement and trust. While less engaged in traditional civic activities, they show signs of increasing volunteerism.

A social and political drive from the 1890s to the 1920s focused on reform and building organizations to enhance social capital. It served as a historical comparison for movements seeking to restore community engagement.

An example of a grassroots organization founded in the Progressive era, facilitating direct interaction between parents and teachers. It is highlighted for its role in fostering social connections and participation in education.

A modern organization cited as part of a new type of tertiary group, which offers membership with minimal personal involvement. It represents the shift toward less socially connective forms of community engagement.