These online archives were chosen because they provide content for linking local Vermont primary sources to national themes and issues.
Ancestry.com (http://www.ancestry.com) is the mother of all census sites. This is the place to start if you want to find basic census data about a person, a family, or even a community. Through Ancestry, it is possible to build portraits of a community at the time of the Civil War or to track Vermonters going west. In addition to the federal censuses, Ancestry provides tons of other similar information, like state-level censuses and other government records. You can subscribe for a month ($20), three months ($51), or annually ($156).
American Memory (http://memory.loc.gov/ammem/index.html) from the Library of Congress gives you access to innumerable images, documents, broadsides, pamphlets, and books on every topic imaginable. Many items are digitized in the context of exhibits, which include explanatory text and essays as well as bibliographic citations. There are many Vermont primary sources such as photographs, maps, and documents at American Memory.
ArcCat (http://arccat.uvm.edu/) is a cooperative catalog describing archival and manuscript collections held by various Vermont institutions. It is similar to a library catalog, but instead of telling you about books and periodicals, it lists unpublished material. In this catalog you will find descriptions of the records of governmental entities, individuals, organizations, and businesses.
History Matters (http://historymatters.gmu.edu/browse/wwwhistory/) has a good library of transcribed primary sources including some from Vermont.
The Gilder Lehrman Institute website (http://www.gilderlehrman.org/) is content-rich and getting better all the time. In addition to essays, primary sources, bibliographies, and timelines, they make available excellent lesson plans and other teacher resources. Vermont primary sources include journals from the French and Indian (Seven Years) War and letters from the Civil War.
Landscape Change (http://www.uvm.edu/landscape/) is a continually growing archive of photographs of places in Vermont, both historical and modern, that documents the changing impact of human activity on the landscape. These images can make a vivid contribution to studies of town settlement patterns, economic development, or changes in agriculture, for example.
The Vermont in the Civil War website (http://www.vermontcivilwar.org/index.php) provides an amazing amount of information about Vermont’s Civil War soldiers, units, officers, battles, you name it. The site gives clear directions and quick links for doing the research.