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.

“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.

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.