Teaching American History has recently published World War I and the 1920s: Core Documents, a collection curated by Professor Jennifer D. Keene, Professor of History and Dean of the Wilkinson College of Arts, Humanities and Social Sciences at Chapman University. Keene, a specialist in American military experience during World War I, has published three studies of this subject, along with numerous essays, journal articles, and encyclopedia entries.

During the late 19th and early 20th centuries American labor fought a sustained battle against American capitalists over who should determine the wages, hours, and working conditions in America's booming factories—ownership or the workers. Battle tactics included dueling messaging in friendly publications, lobbying for favorable laws, and confrontations between strikes and strikebreakers. As is well-known, the struggle grew intense and violent during labor protests like  the 1886 rally at Haymarket Square and the 1892 Homestead Strike. Less well known is  labor activists’ occasional resort to sabotage of anti-union business establishments. In 1910, the Los Angeles Times, a strident anti-union voice in a staunch anti-union state, was a target of domestic violence that took the lives of 21 of its employees.