What is the theme in Democracy in America by Alexis de Tocqueville?

In a democracy, tyranny of the majority happens when a legislative body enacts laws that favor the rights of a majority of the electorate and in so doing, diminish the rights of the corresponding minority. The potential for democratic tyranny can be found at every level of government: Municipal, county, state, or country. It can also be enacted by any kind of political majority based on religion, culture, race, wealth, language. Tyranny of the majority can happen even where and when not intended. Tocqueville argues that democracy is a self-correcting political system that can usually fix its own flaws, if enough time has passed and enough political pressure is applied by minorities.