The document summarizes the history of American public libraries from their origins in the early 20th century through the McCarthy era. It describes how bookmobiles expanded access to libraries and how libraries supported wartime efforts in WWI and WWII by disseminating propaganda and helping with recruitment and relief efforts. It also discusses how the Works Progress Administration and New Deal programs helped libraries during the Great Depression and how McCarthyism led to censorship of materials seen as subversive during the Cold War.