White Americans are the biggest terror threat in the United States, according to a study by the New America Foundation. The Washington-based research organization did a review of “terror” attacks on US soil since Sept. 11, 2001 and found that most of them were carried out by radical anti-government groups or white supremacists.Almost twice as many people have died in attacks by right-wing groups in America than have died in attacks by Muslim extremists. Of the 26 attacks since 9/11 that the group defined as terror, 19 were carried out by non-Muslims. Yet there are no white Americans languishing inside the prison camp at Guantanamo Bay. And there are no drones dropping bombs on gatherings of military-age males in the country’s lawless border regions.