As the U.S. military formally ends operations in Iraq, four top expert voices in the debate on the war differ over whether it merited the cost in blood, treasure, and U.S. credibility.

Post-Qaddafi Libya will face difficulties with rebel infighting, the anger of Qaddafi loyalists, and more, but the long-time dictator’s death also creates an opening for a more peaceful country. CFR’…

Which policies have worked and which ones need work ten years after the worst terrorist attacks in U.S. history? CFR experts examine ten issues that have preoccupied U.S. planners.

Can the United States improve its energy security in a clean, affordable, and efficient way? Five experts offer solutions to the daunting energy challenges facing the United States.

Did President Obama’s troop drawdown plan for Afghanistan undercut the campaign against the Taliban or was it too limited to meet U.S. goals? CFR President Richard N. Haass and Senior Fellow Max Boot…