I believe that the best way to look into American History is to visit the Presidential, Civil War and Civil Rights historical sites.
Historical sites addressed here are Presidential Places, Historical monuments, houses and museums, Civil War, Revolutionary War and
Spanish American War battlefields, Civil Rights sites, and Battleships, Aircraft Carriers, Railroad Museums and related sites, Aviation and Space Museums.
Most if not all the information, especially the photographs are based on our personal travel to these historical places. While the current focus is to help US on US (United States), it will be extended to rest of the world gradually.