Americana artifacts are related to the history, geography, folklore and cultural heritage of the United States of America. Americana is any collection of materials and things concerning or characteristic of the United States or of the American people, and is representative or typical of American culture as a whole.
That is what Wikipedia says, more or less. I think of institutions like American Revolutionary and Civil War sites, the various types of American flags that have been used, and until very recently major league baseball. It, like the other professional sports in America, has been defiled by political and social issue corruption.
You will find American history and symbols of American Patriotism in this gallery.