What point about change was martin luther king jr. making by telling the story of rip van winkle?

Rip van Winkle is a story about a man who slept for 20 years and woke up in a world he did not recognize. Martin Luther King Jr. used this analogy to wake people up, and persuade them to join his cause and fight for freedom and equality, and not turn a blind eye to the issues that have pervaded their country. 

The answer is crop yield.