In addition to destabilizing social changes, the ideals of liberty and equality helped fuel revolutions in the Atlantic world. The call for liberty was first of all a call for individual human rights. Supporters of the cause of individual liberty (who became known as “liberals” in the early nineteenth century) demanded freedom to worship according to the dictates of their consciences, an end to censorship, and freedom from arbitrary laws and from judges who simply obeyed orders from the government.

The call for liberty was also a call for a new kind of government. Reformers believed that the people had sovereignty — that is, that the people alone had the authority to make laws limiting an individual’s freedom of action. In practice, this system of government meant choosing legislators who represented the people and were accountable to them. Monarchs might retain their thrones, but their rule should be constrained by the will of the people.

Equality was a more ambiguous idea. Eighteenth-century liberals argued that, in theory, all citizens should have identical rights and liberties. However, they accepted a number of distinctions. First, most male eighteenth-century liberals believed that equality between men and women was neither practical nor desirable. Second, few questioned the superiority of people of European descent over those of indigenous or African origin.

Finally, liberals never believed that everyone should be equal economically. Great differences in wealth and income between rich and poor were perfectly acceptable, so long as every free white male had a legally equal chance at economic gain. However limited they appear to modern eyes, these demands for liberty and equality were revolutionary, given that a privileged elite had long existed with little opposition.

The two most important Enlightenment references for late-eighteenth-century liberals were John Locke and the baron de Montesquieu. Locke maintained that England’s long political tradition rested on “the rights of Englishmen” and on representative government through Parliament. He argued that if a government oversteps its proper function of protecting the natural rights of life, liberty, and private property, it becomes a tyranny. Montesquieu was also an admirer of England’s Parliament. He believed that powerful “intermediary groups” — such as the judicial nobility of which he was a proud member — offered the best defense of liberty against despotism.

The Atlantic revolutions began with aspirations for equality and liberty among the social elite. Soon, however, dissenting voices emerged as some revolutionaries became frustrated with the limitations of liberal notions of equality and liberty and clamored for a fuller realization of these concepts. Depending on location, their demands included political rights for women and free people of color, the emancipation of slaves, better treatment of indigenous people, and government regulations to reduce economic inequality. The age of revolution was thus characterized by bitter conflicts over how far reform should go and to whom it should apply.