The US Department of Homeland Security has routinely identified terrorism as the largest threat to the security and prosperity of the United States and as a result, the US Government has devoted significant military, monetary, and law enforcement resources to safeguarding our country against terror attacks. When most people Americans think about terrorism, the first thing that pops into their heads are Islamic groups such as ISIS, Al Qaeda, and the Taliban. However, right-wing domestic terrorist groups continue to operate within the United States but seem to draw little attention from both the US government and the public. This paper will use data collected by several United States government agencies as well as private research databases to investigate if radical Islamic terrorists or right-wing domestic terrorists pose a greater threat to the security of the United States and its citizens. It is hoped that the data gathered will inform the readers about various terrorist organizations and provide valuable insights into what areas require more resources and attention as well as what changes should be made to increase our ability to safeguard our country against all terrorist threats.