Read the excerpt from "Standing Out in a Crowd."

For instance, Joe Wos is a cartoonist who started a campaign. He wanted to raise money to self-publish a children's book called The Three Little Pigsburghers. He wrote the story the way people in the city of Pittsburgh talk. People in that city got excited about the book. They had never seen the tale told in this way, so they wanted the book to be published.

What is the cause in this excerpt?

Joe Wos is a cartoonist.
Joe Wos wanted to publish a book.
Joe Wos lives in Pittsburgh.
Joe Wos wrote a book.