When was Nineteenth-Century Literature created?

"Nineteenth-Century Literature" isn't something that was "created" in a specific moment. It's a period in literary history encompassing all literature written in the 19th century, which spanned from 1801 to 1900.

It's not a single work or movement, but a vast array of writing styles, authors, and themes that evolved throughout the century. It's important to note that "Nineteenth-Century Literature" is often further divided into sub-periods, like Romanticism, Realism, and Naturalism, which are all distinct literary movements with their own unique characteristics.