Did they declare war on the U.S? I don't remember if they did. I don't think they did, I don't think that we are their concern. I think they are more worried about establishing their state in the middle east. Al Queada is still a major concern. They still want to do damage to the U.S. I think that we should just let ISIS be, and let them redraw their maps of the Middle East, and let them live their lives. Why should these people be bound to the maps that were drawn by Britain and France after WW I?