The State Department Anthology of American Writers was recently published by—you got it—the U.S. State Department. It includes essays by Michael Chabon, Billy Collins (the current U.S. poet laureate) and others. The link above is to the complete text of this anthology, but the U.S. government is prohibited by law from distributing the link or the publication within the United States. That's because the 1948 Smith-Mundt Act prohibits "domestic dissemination of U.S. propaganda."
The link again is
http://usinfo.state.gov/products/pubs/writers/homepage.htm.
The two most-requested commencement speakers for college graduations in 1972 (in order):