This report uses recent data to update our 2020 calculation of the number of people displaced in the eight most violent wars the United States has waged since 2001, in Afghanistan, Iraq, Pakistan, Yemen, Somalia, the Philippines, Libya, and Syria. Using 2020 and 2021 data unavailable at the time of our initial report, this update conservatively estimates that at least 38 million people have fled their homes—around one million more displaced people than a year earlier.1