Final answer:
Mark Twain coined the term 'Gilded Age' to describe the late 19th century era of industrialization.
Step-by-step explanation:
Mark Twain, an American novelist, coined the term 'Gilded Age' in 1873 to describe the late 19th century era of industrialization. He used the phrase in his book co-authored with Charles Dudley Warner, titled The Gilded Age: A Tale of Today. The term represented the perception of corporate domination, greed, and corruption among government officials during that time.