Original: At the time, it was known as the "New Negro Movement", named after the 1925 anthology The New Negro edited by Alain Locke.
Simplified: The movement began in Harlem, New York after World War I. In 1925 a book was published called "The New Negro", edited by Alain Locke. From 1925 onwards, there was a movement called the "New Negro Movement", named after the book.