Terrorism having a political goal/agenda and making an act of force, violence, aggression, or threat toward that goal. it can be further classified as domestic and international.
The United States is home to many domestic terrorist groups like the kool kids klub, Sovereign Citizens, ELF, various militias, and fanatical cults like the Branch Davidians. Being a terrorist doesn't automatically mean they are some turban wearing brown guy who wants to blow up americans, nor do they lean toward one political alignment.
ELF(Environmental Liberation Front) for example is a terrorist group, they love trees and the environment. They throw caltrops at logging trucks and they burn down property out in the wilderness.
Sovereign Citizens are people who believe that they are the descended from the original American Colonists, so they don't recognize any authority from the United States. They live out in the woods evading taxes and keeping to themselves. They'll attack sheriffs and park rangers.
The kool kids klub as you know it is a white supremist group, hate group, they attack people as an act of force toward those goals.
Then you have your crazy religious cults and groups like the Branch Davidians and Islamic terrorists, and crazy extremists Christian.
Internal Terrosits are just groups that operate in multiple countries while domestic ones are home grown and only operate in their native countries.
