Portal:United States/Did you know

Usage
These "Did you know..." subpages are randomly displayed using Random subpage.
 * 1) The layout design for these subpages is at Portal:United States/Did you know/Layout.
 * 2) Add a new DYK to the next available subpage, including up to three hooks per page.
 * 3) Update the "Random subpage" start and end values above to include the new DYK and evenly distribute the number of items across the display templates.