Final answer:
The exact time when Semester in San Francisco became a core course offering is not detailed in the historical context provided. Student movements in the 1960s led to greater diversity in academic offerings, and the development of OERs reflects ongoing changes in higher education.
Step-by-step explanation:
The Semester in San Francisco does not appear to be a core course offering addressed within the historical context provided in the question. Historically, student movements in the 1960s, such as the Free Speech Movement at UC Berkeley, evolved alongside educational changes.
Chicano students at San Francisco State and other colleges fought for more representation in academic offerings, which might suggest the inclusion of more diverse courses over time. However, the specific inception of Semester in San Francisco as a core course offering is not detailed in the information provided.
Further details about the evolution of course offerings, following student movements and advocacy for a broad and diverse curriculum, is noted in the development of Open Educational Resources (OER).
As seen with the collaboration of art historians across five California campuses to create an OER art history textbook, educational content has been democratized to eliminate barriers for students.
Nonetheless, the exact date when Semester in San Francisco became a core course offering would require additional specific information about the program mentioned.