A belief in Biblical prophecy
No the US does not negotiate with terrorists.
I'm pretty sure it's when the terrorists are from the same country they attack. Like Oklahoma City was. In most cases, it also refers to those terrorists attacking targets inside their own country. Thus, bombing a military base owned by country A but inside country B by terrorists originating from country A is usually not known as "domestic terrorism". However, the people performing such an attack are known as "domestic terrorists", as they target things from their own country. It's a subtle difference.
Too many people who life in the US buy narcotics from groups which fund terrorists
Yes, the Department of Homeland Security was established to protect the US from terrorists.
So far, the majority have been on the Right, such as Oklahoma City bomber Tim McVeigh. Many bombers are not politically affiliated, just independent psychopaths, such as Unibomber Ted Kaczynski. Most domestic terrorists, however, have no true political identity. Many have had and have an Islamic background as in the bombing of the Boston Marathon instance.
The reasons terrorists target the United States are at this time only speculation.
THERE ARE CELLS OF TERRORISTS OPERATING IN THE US.
Terrorists are enemies of the U.S.
"The great Satan"
US is at war with no nation; only terrorists.
Domestic Employees are individuals that do various odd jobs, ie., painters, yard workers, common labors that most of us don't want to do.
If 1 in a million Americans are terrorists, then there are over 300. Groups like the KKK were terrorists. Arguably the US Government is terroristic: In 2001 almost 3 000 people were murdered by Al Qaeda. In 1991 over 100 000 Iraqis were killed so an emir of a nation not even a US ally could get his throne back.