The 15th Amendment Is Adopted: A Promise and a Struggle for the Right to Vote

What Happened?

The promise of the 15th Amendment was simple: no American citizen should be denied the right to vote because of the color of their skin. Passed by Congress in 1869 and formally adopted on March 30, 1870, it was a major win for the Reconstruction-era movement to extend civil rights to formerly enslaved Black Americans.

Just one day after its ratification, Thomas Mundy Peterson of Perth Amboy, New Jersey, became the first African American to vote under the new amendment. Across the South, Black voters and leaders rose quickly—helping elect representatives, build public education systems, and reshape democracy. By 1877, over 600 African Americans had served in state legislatures, and 16 in Congress, including Hiram Rhodes Revels of Mississippi—the first Black U.S. senator.

But this era of Black political power was short-lived. As Reconstruction ended and federal troops withdrew, white supremacist groups like the Ku Klux Klan used violence and terror to prevent Black people from voting. States passed new laws—poll taxes, literacy tests, and property requirements—that didn’t mention race but targeted Black voters all the same.

Despite these setbacks, the 15th Amendment endured. It became the legal foundation for future civil rights victories, from the Voting Rights Act of 1965 to ongoing fights for voter access today. It’s a reminder that freedom is not just declared—it must be defended, generation after generation.

Why It Matters

The 15th Amendment was more than a legal document—it was a declaration that Black voices mattered in the shaping of American democracy. Though often denied in practice, its promise laid the groundwork for the civil rights movements of the 20th and 21st centuries. We honor not just its passage, but the struggle it ignited.