Violent white supremacists and anti-government, accelerationist, and like-minded individuals continued to promote violent extremist narratives, recruit new adherents, raise funds, and conduct terrorist activities in the United States and worldwide. 

The leading cause of domestic terrorism in the USofA is anti-government, anti-authoritarian violent extremists (aka coup d'état cosplayers)

~ https://www.gao.gov/blog/rising-threat-domestic-terrorism-u....