4 definitions
Definition.com
American history (n.) gets shorter the closer it comes to anyone still alive.
Definition.com
American history (n.) is like a family album where someone keeps cropping the edges.
Definition.com
American history (n.) is taught fastest in May, when the school year runs out before the twentieth century does.
Definition.com
American history (n.) is taught as a list of things that were fixed, in the order they were fixed.