In our TL, al-Qaeda and ISIS were arguably the biggest enemies in the U.S.'s public imagination in the early 21st century.
However, what I am curious about is this--with a PoD of 1990 or later, which other terrorist groups could have taken al-Qaeda's and ISIS's place as the biggest enemies in the U.S.'s public imagination in the early 21st century?
Any thoughts on this?
Also, for the record, the terrorist group(s) in question would have to launch a massive attack on U.S. soil like al-Qaeda did as well as to create a mini-state--even for a couple of years--like ISIS did.
Finally, to avoid any misunderstanding about this, I am simply curious about this; indeed, I am curious to see what alternatives there could have been for this considering that al-Qaeda and ISIS would probably live on as big enemies in the U.S. public imagination for decades to come--long after their physical presence will be decimated.