There’s a name for fulfilled Book of Mormon prophecies: American Exceptionalism.
“American exceptionalism is the theory that the United States occupies a special niche among the nations of the world in terms of its national credo, historical evolution, political and religious institutions, and its being built by immigrants. The roots of the belief are attributed to Alexis de Tocqueville, who claimed that the then-50-year-old United States held a special place among nations, because it was the first working representative democracy.” (Source)
“Out of the thousands of years of suffering and oppression that comprise human history, a light burns brightly for just a couple of hundred years. The American experiment: a revolutionary idea that the common man can be free, master of his own government, so long as he himself is ruled by God. For a short time this brilliant young country dazzles all the world and all of history, not just with its power and productivity and progress, but with its goodness.” (Source)