On the Great Wall of Texas
By Harry Heyoka
You set the price!
Published: May 24, 2009.
In 2045 a sergeant shows a young draftee the ropes of guarding the Mexican border, explaining how the Wall came to be built and why they are there.
This is a short-short story, for general audiences, set very early in Harry Heyoka's all-too-plausible Spiral's Realms future history.