Thankfully, while your first assertion is (sadly) accurate, your 2nd is not. From the wikipedia article you cited:

> "Literacy in the United States was determined by the National Center for Education Statistics to be at a mid to high level in 2019, at 79%, with 21% of American adults categorized as having "low level English literacy," including 4.1% classified as "functionally illiterate" and an additional 4% that could not participate.[1] According to the U.S. Department of Education, 54% of adults in the United States have prose literacy below the 6th-grade level."

Functional illiteracy is more like 4-8%.