Government is not the only democracy in the USA. Labor unions, for example, are structured around the concept of majority rule.
All democracies are at risk of becoming tyrannies. Either by force of majority ignoring minority interests, or by insiders and operatives who work the system to their advantage over the interests of those they’re supposed to represent.
Workers at a Boeing factory in South Carolina decided that their union was no longer working for them. By secret ballot, laborers fired the union: