“Massacre in El Salvador,” a collaboration with Frontline and ProPublica, tells the story of the worst massacre in recent Latin American history, and why a final reckoning is at risk.

Officials who drove the decades-long war in Afghanistan look back on the strategic mistakes and misjudgments that led to a 20-year quagmire.

For teachers: This video is part of a collection of resources including four short films, each accompanied by a lesson plan and student activity.

Driven by fears of the rise of communism, the United States adopted a policy of containment, intervening in the politics of countries across the globe. In Latin America, the consequences of those efforts are still unfolding.

Russian President Vladimir Putin controls the world’s largest nuclear arsenal, and his invasion of Ukraine is a reminder that Russia, the U.S. and many other countries have thousands of nuclear missiles, even as safeguards once in place have fallen away.