Yes, but its even more of a unit in the other sectors lol. That and technically U.S agriculture is extremely subsidized by the government to keep it as big as it is, though Im not sure if that affects the graph here.

Yes, the US is the world's largest food exporter, exporting twice as much food as any other country. https://www.worldatlas.com/articles/the-american-food-giant-the-largest-exporter-of-food-in-the-world.html