Resource: Think campaign contributions are a recent point of contention in politics? "Campaign Contributions Cause Colossal Crimes" is a political cartoon from 1924, part of the online exhibit Running for Office from the National Archives and Records Administration.
License: Federally produced documents are public domain. Other materials may be licensed by NARA and available for educational use.
Additional info: NARA also has Teacher Resources including suggestions on including primary resources in the classroom and teaching "historical thinking skills".