After 52 years and 220,000 deaths, the Colombian government and the Revolutionary Armed Forces of Colombia (FARC) officially signed a peace treaty on Monday, ending a bloody civil war.
U.S. Secretary of State John Kerry and UN Secretary-General Ban Ki-moon were present for the signing, as were 2,500 other special foreign guests.
President Juan Manuel Santos led the crowd in chants of "No more war!" after the treaty was signed.
WATCH | The atmosphere was festive, but some guests, dressed in all white, were moved to tears. At one point, Santos offered FARC commander Rodrigo Londono a dove-shaped pin. Londono attached it to his own shirt as a gesture of peace.
As head of state of the fatherland we all love, I want to welcome you to democracy.
Londono, better known by his alias Timochenko, said there was "no turning back" on the FARC's decision to abandon the war.
"Let no one doubt that we are going into politics without weapons," he said.
WATCH | Londono also apologized "for all the pain that we have caused," to thunderous applause. (Skip to 2:17 for the apology in Spanish.)
So now what?
The United States has yet to remove FARC from its list of terrorist organizations, even after the European Union said it would do so.
"We clearly are ready to review and make judgments as the facts come in," Kerry told reporters.
Colombian voters will decide on Sunday whether or not to ratify the deal. It's expected to pass.
The treaty means there are no longer any traditional wars in the Western Hemisphere.
The Associated Press contributed to this report.