This summer the FBI announced the rate of domestic terrorism-related arrests is rising in 2019 and confirmed the largest single group of extremists held were white supremacists.
And yet many Americans - including US President Donald Trump - still refuse to call those who commit the deadly attacks terrorists.
So what is causing the rise in white supremacists and - after attacks in Charleston, Charlottesville, Pittsburgh and El Paso - why is it so hard to categorise them as terrorists?
Natalia Jorquera explains in the video above.
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