I discovered this easy portal to see all recent reports from the Congressional Research Service. They are all in the public domain because they are written and published by the U.S. government (each document also has a handy disclaimer at the end telling the reader that the document is in the public domain).
The reports cover all manner of things like U.S. law, recent events, international politics, the economy, etc. If you narrow the search criteria to "Posts" and/or "Resources" using the panel on the left-hand side, the results are all pretty short articles. Narrowing by "Reports" gives you much longer articles.
"Posts" and "Resources" would work well for our Short Nonfiction Collection. You could also choose some related articles and put them together in one collection.
Many of the "Reports" might be long enough to be solo projects.
Happy reading!
