What did de Tocqueville warn might threaten American civic life and democracy?

Alexis de Tocqueville warned that the greatest threat to American civic life and democracy could arise from the tyranny of the majority, where the majority's interests could overshadow and suppress minority rights and opinions. He also expressed concern about individualism leading to social isolation, which could weaken communal ties and civic engagement. Additionally, Tocqueville cautioned against the potential for materialism and pursuit of self-interest to undermine democratic values and the spirit of public service.