Violence from international sources against the United States will continue to come from which of the following?

Violence from international sources against the United States is most accurately attributed to religious extremists from Middle Eastern spillovers. This classification encompasses a significant range of groups and individuals who may be motivated by ideological, religious, or political grievances and who often operate across borders. They may engage in terrorism or other forms of violence targeted at U.S. interests due to perceived injustices or conflicts involving the United States in their regions.

The prevalence of this kind of violence has been underscored by numerous events, especially post-9/11, where radicalization and extremist ideologies have led to various terrorist acts aimed at the U.S. This threat is compounded by the ability of these groups to exploit regional conflicts, recruit individuals, and create networks that allow them to execute acts of violence on a global scale, including within the United States.

While other groups like the Provisional Irish Republican Army, the Jewish Defense League, and Omega 7 have had historical significance and may pose localized threats, they do not represent the ongoing and pervasive threat level that is recognized with religious extremists, especially those influenced by geopolitical conflicts in the Middle East. Thus, the dynamics and patterns of violence attributed to religious extremists make this the most accurate choice in the context of the question.