There are various ways to express that you have been involved in activism to include Asian American History in K-12 curriculum. The wording can be tailored to your specific experiences and activities, but here are some phrases to convey your engagement:

1. "I advocated for the inclusion of Asian American History in K-12 curriculum."
2. "I actively worked to incorporate Asian American History into the K-12 educational syllabus."
3. "I campaigned for the integration of Asian American History into the K-12 educational framework."
4. "I participated in efforts to promote the teaching of Asian American History in K-12 schools."
5. "I lobbied for the recognition and incorporation of Asian American History into K-12 curriculum."
6. "I dedicated my time to raising awareness and supporting the integration of Asian American History into K-12 education."
7. "I was a part of the movement to expand the coverage of Asian American History in K-12 classrooms."
8. "I was actively involved in initiatives aimed at diversifying K-12 curriculum with Asian American History."

Feel free to modify these statements to accurately represent your specific involvement and contributions to the cause.