Final answer:
Dr. Seuss wrote 'Green Eggs and Ham' after being challenged to use only 50 different words, resulting in a significant contribution to children's literature.
Step-by-step explanation:
Dr. Seuss was once challenged by his publisher to write a book using only 50 different words. The book that resulted from this challenge is 'Green Eggs and Ham'. The constraint of using a limited vocabulary set did not hinder Dr. Seuss; instead, it led to a highly creative and successful work. 'Green Eggs and Ham' went on to become a significant part of children's literature and is known for its unique storytelling approach and repetition that helps in early literacy development.