An 1870s novel about greed and corruption gave which "gold-covered" name to an era of U.S. history?

An 1867 flood in which state allowed a steamboat to travel down Chattanooga's main street? Mussorgsky's 1867 symphonic composition is about a night on what? An 1868 definition described which term as men "traveling with little luggage and less character" to profit from the si… Which author's 1870 novel mentions Moby Dick as well as a sea monster called a kraken? Which Italian-born king of Spain abdicated in 1873, about a year after a Carlist revolt broke out? Which poem from Lewis Carroll's "Through the Looking-Glass" includes the line "The time has come to talk of many things… An 1873 law required which Latin motto to appear on U.S. coins? An 1876 bank robbery attempt is reenacted during "Defeat of Jesse James Days" in Northfield, in which state?