Only 7% of private sector laborers are in a union of any kind in the US. That rate has fallen sharply for several decades, and the political apparatus of the United States, especially the Republican party, has been deliberately eradicating labor unions since WWII. That's the whole "Right to Work" thing.
umm, maybe start here and just ... I dunno, click around a bit. https://en.wikipedia.org/wiki/Labor_unions_in_the_United_Sta...
