Organizational Strategy in Persuasive Writing

Read the following excerpt from a persuasive essay:

"In recent years, public parks in urban areas have increasingly become vital spaces for community interaction. Not only do these parks provide recreational opportunities, but they also contribute to the mental health of residents. However, due to budget cuts, many cities struggle to maintain these essential spaces. Therefore, it is crucial that local governments prioritize funding for public parks."

What organizational strategy does the author primarily employ in this excerpt to enhance their argument?