Why is the Second American Revolution (1812 - 1815) never discussed?

"The first American Revolution spanned from 1775 to 1783, after which the United States received recognition of independence by and from the Kingdom of Great Britain. Rhetorical or hyperbolic references to a Second American Revolution have been made on a number of occasions throughout the history of the United States.

Historical statements
A second (or third, or fourth) American revolution was conceived early on as attainable via the Article V Convention, as set forth in the U.S. Constitution. Occasional conventions were envisioned by many of the country's founding generation of leaders to be a sort of institutionalized avenue toward the ideal of revolution every twenty years, often attributed to Thomas Jefferson. According to Samuel Williams of Vermont (1743-1817), it was to be the means to accomplish periodic constitutional adaptation to changing times. Born the same year as Jefferson, Williams saw the federal constitutional convention as the vehicle for what loose constructionists today term the “living, breathing constitution.”

The War of 1812 between the United States and Britain is sometimes referred to as the second American Revolution, stemming from the second British recognition of 1781 American borders. John C. Calhoun was perhaps the first to make this claim.

Some Confederates claimed that they were fighting a second American Revolution in attempting to secede from the United States during the American Civil War. An example of this thinking is James M. McPherson's book, Battle Cry of Freedom."
Source and further information:
http://en.wikipedia.org/wiki/Second_American_Revolution

(the article presents also some fictional usages of the term)

It does get discussed. Only it's more commonly known as the War of 1812

http://en.wikipedia.org/wiki/War_of_1812

Furthermore, the so-called Second American Revolution largely consisted of the British army and navy kicking the rear-ends of their American counterparts. If the British hadn't been busy warring with France at the time, Michigan and Maine would probably be Canadian provinces today.

Americans don't like talking about wars where the USA didn't kick butt....;-D...

Probably because for the same reasons the Whiskey Rebellion isn't discussed.

http://en.wikipedia.org/wiki/Whiskey_Rebellion