The Islamic State's effort to terrorize the United States appears to be working.

A new survey from the Public Religion Research Institute released Thursday shows a sharp increase in the number of Americans who are actively worried about terrorism. In November 2014, a third of Americans said they were "very" or "somewhat" worried about themselves or a family member being a victim of a terrorist attack. This year, after attacks in Paris and San Bernardino, Calif., nearly half of Americans say they share that concern.

Terrorism is also the issue Americans consider critical — far more than illegal immigration and slightly more than mass shootings.

Read the complete original version of this item...