The American Historical Association (AHA) is the oldest and largest society of historians and professors of history in the United States. Founded in 1884, the association promotes historical studies, the teaching of history, and the preservation of and access to historical materials. It publishes The American Historical Review five times a year, with scholarly articles and book reviews. The AHA is the major organization for historians working in the United States, while the Organization of American Historians is the major organization for historians who study and teach about the United States. The group received a congressional charter in 1889, establishing it “for the promotion of historical studies, the collection and preservation of historical manuscripts, and for kindred purposes in the interest of American history, and of history in America.”