Was Mark Twain accurate when naming the period from 1877 to 1914 the Gilded Age?

From 1877 to 1914 the United States truly underwent drastic changes. The civil war being over, the US could finally consider itself to be a united country and with the industrial revolution bringing along new technologies to the advancement of society as a whole, America was a country full of opportunities for its people. Superficially, this might seem to be the case, but unfortunately though, a wealthy minority used these developments to their sole advantage and by establishing huge monopolies, they exploited the lower class, causing social problems, and used their power to influence the…