Try this interactive site for Martin Luther King's iconic I Have A Dream Speech. With this site you will hear the speech again for the very first time.
Historical documents organized into different eras and topics
Maps that show visual history--from empires to plagues. Sign up required, but great for visual learners.
50 States: Up-to-date information about the 50 U.S. states
Google Historical Voyages and Events is focused on explorers and their voyages throughout history.
Ready-to-use teaching documents, activities and primary resources
"100 Best Speeches" is a go-to resource for implementing text analysis, text structure, and annotations/connotations.
A historical look at the U.S. Presidential Campaigns through radio and tv commercials
Google Cultural Institute has online, historical exhibitions: “a narrative which links the archive material together to unlock the different perspectives, nuances and tales behind these events.”
Abraham Lincoln at the Crossroads looks at the decisions that shaped Lincoln's life and the path of the U.S. during the Civil War.
History and Politics Out Loud has a searchable database of famous and important speeches.