Calisphere is the University of California's free public gateway to a world of primary sources. More than 150,000 digitized items including photographs, documents, newspaper pages, political cartoons, works of art, diaries, transcribed oral histories, advertising, and other unique cultural artifacts reveal the diverse history and culture of California and its role in national and world history. Each topic is a primary source set of 20-30 selected images (photographs, documents, newspaper clippings, political cartoons, art, and other cultural artifacts). Brief overviews of each topic provide historical context for images. Themes align with K-12 California Content Standards in History-Social Science, English-Language Arts, and Visual Arts.