This is a great fact-checking. Bringing in outside sources and broadening the scope of the claim strengthens it heavily, and proves your well-rounded understanding of the topic. Especially mentioning how the community stands behind the rallies gives good context to the reader for what to expect as a result from this. I would add to your analysis this quote from the KATU ABC article: "Teachers are asking for smaller classrooms and better resources for students with individual behavioral needs." This gives more specific reasoning for the strike, and helps readers understand exactly what the teachers are fighting for.