Terrorism:
Much of the terrorism noted earlier will be directed at the United States and its overseas interests. Most anti-US terrorism will be based on perceived ethnic, religious or cultural grievances. Terrorist groups will continue to find ways to attack US military and diplomatic facilities abroad. Such attacks are likely to expand increasingly to include US companies and American citizens. Middle East and Southwest Asian-based terrorists are the most likely to threaten the United States.

http://www.cia.gov/cia/reports/globaltrends2015