Al-Qaeda will now have a more permissive environment in which to operate, but the precise context will be important for the U.S. policy response.

White supremacists and other far-right ideologues are drawing inspiration from Ted Kaczynski's anti-technology manifestos.

Spain's close counterterrorism cooperation with Morocco provides a model for effective international efforts to prevent terrorist attacks.

Does the United States still have the grit necessary to fight and win long wars?

The Syrian government got off the hook for facilitating the terrorist group's rise and funding its operations.

The presence of international terrorist groups may grow in the months and years ahead, but there are steps the United States can take to mitigate the risks.

Cyberattacks present unique challenges, but governments and businesses can learn from other forms of hostage-taking.

Commentators trying to pass blame for the handling of the Afghanistan withdrawal get the alliance's role in the conflict wrong.

The political violence perpetrated by white supremacists in response to Reconstruction and its long-term effects hold lessons for modern counterterrorism policy.

The Ethiopian government declared a truce in June, but fighting has continued and the humanitarian crisis has worsened.

Governments need to set norms and establish best practices early as countries begin to launch their own, official digital currencies.

Who controls territory in Afghanistan? The answer is complicated in ways that can't be expressed in a map.