---It is the title of a 1938 poem by Langston Hughes, and Kerry has mainly been invoking its first lines: "Let America be America again. Let it be the dream it used to be." ----
I'm no historian, but my first thought is that the poem recalls the fun and good times of the roaring twenties. I think Kerry wants to go back to the good old roaring 90's.
Back then it was something called the "Depression" that changed everything. Today it is "9/11".
I wonder if the 1938 poem has "isolationism" aspects to it as well, with the war looming in Europe.
The poem's in post 5. We aren't going back anywhere, it could be titled, if you include the refrain
Let America Be America Again--(America never was America to me.)
Or, as the author's bio notes,
no "Jim Crow," no anti-semitism, and education and medical care for everyone. Stalin delivers., the ideal, Stalinist Russia