The Avalon Project is a site from Harvard University that contains thousands of documents relevant to Law, History, Economics, Politics, Diplomacy and Government. These documents also include links to supporting documents that were referred to in the text.
The documents are sorted by date range and go all the way back to 4000BC. The documents are fully searchable and are also sorted by collections such as American Revolution, Jefferson Papers, Geneva Convention, the Middle East, and more. There are even transcripts of witness testimony in the Nuremberg Trials. Pretty amazing stuff.
This is a priceless resource for any educator or student, teaching or learning, reading or researching these topics. These documents are primary sources and can be used for a variety of learning.