The Declaration of Independence proclaimed principles of liberty and equality that would echo throughout history.

Yet from the moment it was written, many Americans recognized a painful contradiction at its center.

The same society declaring that “all men are created equal” also permitted slavery.

By 1776, slavery existed in every colony, though it was especially central to the economy of the South. Hundreds of thousands of enslaved African Americans lived and labored under a system that denied nearly every right the Declaration claimed as natural and universal.

The contradiction was impossible to ignore.

Many of the revolutionary leaders speaking most passionately about liberty owned enslaved people themselves. Thomas Jefferson, author of the Declaration, enslaved hundreds of men, women, and children during his lifetime.

The Revolution therefore emerged from a society deeply divided between its ideals and its realities.

Jefferson’s original draft of the Declaration actually included criticism of the transatlantic slave trade.

He accused the British Crown of sustaining and encouraging the trade in human beings. But delegates from several southern colonies strongly objected to the language.

Congress ultimately removed the passage from the final document.

The deletion revealed how politically sensitive slavery already was at the nation’s founding.

Even as Americans united around independence, slavery threatened that unity.

Some revolutionary leaders believed slavery contradicted the principles of the Revolution entirely.

A number of northern states gradually began moving toward abolition during or after the war. Antislavery sentiment also grew among certain religious groups and political thinkers who argued that liberty could not logically coexist with human bondage.

At the same time, many southern leaders defended slavery as economically necessary and socially foundational.

The Revolution therefore did not resolve the issue.

Instead, it exposed a contradiction that would continue growing within American society for generations.

Enslaved African Americans responded to the Revolution in complex ways.

Some hoped revolutionary ideals might eventually lead to greater freedom and equality. Others focused less on political philosophy and more on immediate opportunities for liberation created by the war itself.

Thousands escaped to British lines after British officials promised freedom to enslaved people who fled Patriot owners and supported the Crown.

Others served with Patriot forces in hopes that military service might lead to freedom or recognition.

For many enslaved people, the Revolution became a struggle not simply between Britain and the colonies, but between slavery and the possibility of liberty.

Yet independence did not end slavery.

In fact, slavery would expand dramatically in the decades following the Revolution, particularly across the South as cotton agriculture grew increasingly profitable.

Still, the language of the Declaration could not easily be contained.

The principles Jefferson wrote in 1776 would later be used by abolitionists, reformers, formerly enslaved people, and civil rights advocates to challenge slavery itself.

Again and again, Americans would return to the Declaration’s words and ask whether the nation truly believed its own ideals.

The Revolution had proclaimed universal rights.

The struggle over who those rights actually belonged to had only begun.