Child Labor
Vermont Historical Society Child Labor lessons based on Lewis Hine photos and Counting on Grace
Agriculture
Growing a Nation: A History of American Agriculture
From the government’s Economic Research Service, the premier source of research on American agriculture, comes this series of extensive timelines that can be searched by decade or by topic.
Immigration
Immigration to the United States, 1789-1930
Various digitized historical materials from the Harvard University Library: documents, photographs, also a very good timeline. The Lower East Side Tenement Museum website
Lower East Side Tenement Museum
The Tenement Museum site has lesson plans, primary sources, and a great encyclopedia on topics like immigrant groups, the labor movement, and urban life.