Why did Mark Twain call these years the “gilded age”?

The writer Mark Twain called these years a “gilded age”, bearing in mind that behind the external splendor of economic success hid an unsightly political wrong side. One of its manifestations was a racial problem.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.