Bannon's company Cambridge Analytica was a subsidiary of SCL Group, a British psyops/infoops firm that explicitly intended to tamper in foreign elections.
US money paid to such firms also paid for Brexit.
US money paid to such firms also paid for Brexit.
Ironically, Britain backed the slaving south in the US Civil War; Britain wanted the south the secede from the Union.
The film National Treasure: Book of Secrets mentions this.
"Internet Research Agency": https://en.wikipedia.org/wiki/Internet_Research_Agency