Drum and bass has been alive in the United States since the early 1990s. San Francisco had a scene. Los Angeles had a scene. New York, Dallas, Chicago, DC — they all had scenes. Real parties. Real artists. Real culture built by real people who chose this music when it was underground and kept it alive when no one was paying attention.
None of it was documented. None of it was centered. The media that covered DnB covered the UK, because that's where the infrastructure was — major labels, national radio, a centralized club circuit. American heads built the scene anyway, self-funded and invisible to the rest of the world.