
It isn’t one or the other, it’s both: soya oil and meal (what’s left after pressing the oil out) are so-called “co-products” - you get about 20% oil, and 80% meal. The meal goes almost exclusively into animal feed, the oil then goes into various other products, including animal feed and food industry, where it is used in mostly non-vegan products (because vegan products only constitute a small proportion of industrially produced food products).
Your 80% figure pressed for oil includes soya meal used for animal feed.

The US is strange then. This side of the pond, the UK is not considered a leading light in vegan progress. Lots of other countries have more vegans. I’ve lived in more rural areas in the UK (e.g. Wales) and although it was harder, it was still possible.