Which terrorist group has been a major force in the conflicts in Iraq, Syria, and Yemen?

Answer 1

Oh, my! There are more than one!

Four of the terrorist groups that have been most active since 2001 are Boko Haram, Al Qaeda, the Taliban and ISIL. These groups have been most active in Iraq, Afghanistan, Pakistan, Nigeria and Syria. 80 percent of all deaths from terrorism occurred in one of these five countries.
from https://en.wikipedia.org/wiki/Terrorism

Boko Haram is active in Africa, but the other three have been active in the Middle East. To determine how you will choose one as the "major" group, you'll need to read that article linked above, and some of the references and external links at the bottom of that article.

Let us know what you decide.

Answer 2

um no.....