Every time a drunken, crazed, right wing hoodlum yells "Yee-Haw" and blows up a non-christian house of worship or murders those wearing clothing different from the standard boots and jeans, He is actually following in the footsteps of the Southern Jihadist War of Aggression.
To demonstrate how deeply "our" (meaning European white) American culture has been influenced since its inception;
The battle cry: "Yee-Haw" is actually derived from, you guessed it: "Ji-Had".
Muslim culture, whether "we" like it or not has been with US since the beginning.
So They're correct. Most of the redneck terrorist attacks may well have jihadist roots.
At least those where they cry out for holy-war.