Library of Congress Digital Collections (formerly American Memory)—Premier collection of digitized American primary source material, from texts to photographs. Created by the Library of Congress.
https://loc.gov/collections/
EuroDocs: Primary Historical Documents from Western Europe—Links to selected primary source documents (transcribed, reproduced in facsimile, or translated) arranged by country.
http://eudocs.lib.byu.edu/index.php/Main_Page
Making of America—Large and diverse full-text collection of books and journals, mainly from 1850-1870, made available by the University of Michigan.
https://quod.lib.umich.edu/m/moagrp/
Famous Presidential Speeches--Speeches by American presidents from George Washington through Donald Trump. The collection includes text, audio, and video files.
http://millercenter.org/the-presidency/presidential-speeches
Primary Sources on the Web, Finding, Evaluating, Using--A gateway site providing links to various digital collections, along with information about evaluating and citing sources. Created by American Library Association's Reference and User Services Association.
http://www.ala.org/rusa/sections/history/resources/primarysources